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Anomalous in-plane electronic scattering in charge ordered Na 0.41CoO 2•0.6H 2O / G. X. Cao [et al.] // Phys. Rev. Lett. - 2012. - Vol. 108, Is. 23. - Ст. 236401, DOI 10.1103/PhysRevLett.108.236401. - Cited References: 41. - We thank H. Habermeier, D. Mandrus, B. C. Sales, I. Eremin, I. I. Mazin, and P. J. Hirschfeld for useful discussions. G. Cao acknowledges support from NSFC (No. 10804068, 10774097). M. M. K. acknowledges support from RFBR (Grant No. 09-02-00127), Presisium of RAS program "Quantum physics of condensed matter" N5.7, Integration Grant of SBRAS-UrBRAS N40, and Russian FCP (GK 16.740.12.0731), and The Dynasty Foundation and ICFPM. Work at ORNL was supported by the Department of Energy, BES, Materials Science and Engineering Division. . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
   TRIPLET
   FLUCTUATIONS
   IONS
Аннотация: We report electronic transport measurements on high quality floating zone grown NaxCoO2 and Na0.41CoO2·0.6H2O single crystals. We find an in-plane electronic scattering minimum near 11 K and a clear charge ordering at approximately 50 K. The electronic and magnetic properties in hydrated and nonhydrated Na0.41CoO2 samples are similar at higher temperature, but evolve in markedly different ways below ∼50 K, where a strong ferromagnetic tendency is observed in the hydrated sample. Model calculations show the relationship of this tendency to the structure of the Fermi surface. The results, particularly the clear differences between the hydrated and nonhydrated material show a substantially enhanced ferromagnetic tendency upon hydration. Implications for superconductivity are discussed.

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Держатели документа:
[Cao, Guixin
Gao, Yuze
Le Tacon, Mathieu
Lin, Chengtian] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany
[Cao, Guixin] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China
[Cao, Guixin] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[Korshunov, Maxim M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, Maxim M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Singh, David J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

Доп.точки доступа:
Cao, G. X.; Korshunov, M. M.; Коршунов, Максим Михайлович; Gao, Y. Z.; Le Tacon, M.; Singh, D. J.; Lin, C. T.
}
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Nature of optical properties of GdFe3(BO3)4 and GdFe2.1Ga0.9(BO3)4 crystals and other 3d5 antiferromagnets / A. V. Malakhovskii [et al.] // Eur. Phys. J. B. - 2012. - Vol. 85, Is. 2. - P. 80, DOI 10.1140/epjb/e2012-20953-1. - Cited References: 70. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by Russian President Grant NSh-1044.2012.2. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)4
   D-D TRANSITIONS
   EARTH FERROBORATES RFE3(BO3)4
   ABSORPTION-SPECTRA
   OCTAHEDRAL COMPLEXES
   ELECTRONIC-STRUCTURE
   NEEL TEMPERATURE
   FINE-STRUCTURE
   EXCHANGE
   IONS
Аннотация: Influence of the partial substitution of paramagnetic Fe3+ ions by diamagnetic Ga3+ ions in the trigonal crystal GdFe3 (BO3)4 on its optical and magnetic properties is studied and discussed in connection with problems common for all antiferromagnets containing 3d 5 ions. Polarized optical absorption spectra and linear birefringence of GdFe3 (BO3)4 and GdFe2.1Ga0.9 (BO3)4 single crystals have been measured in the temperature range 85–293 K. Specific heat temperature dependence (2–300 K) and structure of GdFe2.1Ga0.9 (BO3)4 crystal have been also studied. As a result of substitution of 30% Fe to Ga the Neel temperature diminishes from 38 till 16 K, the strong absorption band edge shifts on 860 cm-1 (0.11 eV) to higher energy and the d-d transitions intensity decreases substantially larger than the Fe concentration does. Strong absorption band edge is shown to be due to Mott-Hubbard transitions. Correlation between position of the strong absorption band edge and the Neel temperature of antiferromagnets has been revealed. Properties of the doubly forbidden d-d transitions in the studied crystals and in other antiferromagnets are explained within the framework of the model of the exchange-vibronic pair absorption, which is theoretically analyzed in detail. The model permitted us to determine the connection between parameters of d-d absorption bands (intensity, width and their temperature dependences), on the one hand, and the exchange, spin-orbit and electron-lattice interactions, on the other hand.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Kartashev, A. V.; Карташев, Андрей Васильевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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Uniaxial magnetic anisotropy of rhombohedral CoCO3 crystals at T = 0 K / V. V. Men'shikov [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 3. - P. 468-472, DOI 10.1134/S1063783414030196. - Cited References: 21 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNETIC RESONANCE
IONS
Аннотация: A method for calculating the contribution of exchange interaction to uniaxial anisotropy with the use of g' factors has been worked out using CoCO3 crystals as an example. The calculated contribution of dipole-dipole interactions to the anisotropy of CoCO3 is 0.93 cm(-1). The sum of the contributions to the anisotropy constant of CoCO3 with the inclusion of the dipole-dipole interactions is 36.1 cm(-1).

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Публикация на русском языке Одноосная магнитная анизотропия ромбоэдрических кристаллов CoCO3 при T = 0K [Текст] / В. В. Меньшиков [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 3. - С. 459-462

Доп.точки доступа:
Men'shikov, V. V.; Меньшиков, Виктор Васильевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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    Synthesis and luminescence properties of blue-emitting phosphor Li3c2(PO4)3:Er2+ / S. X. Yu [et al.] // ECS J. Solid State Sci. Technol. - 2014. - Vol. 3, Is. 8. - P. R159-R163, DOI 10.1149/2.0071408jss. - Cited References: 33. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, No. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). Z. G. Xia is also grateful for the financial support from University of Science and Technology Beijing. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 2162-8769. - ISSN 2162-8777
   Перевод заглавия: Синтез и люминесцентные свойства синего люминофора Li3Sc2(PO4)3:Eu2+

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ENERGY-TRANSFER
   PHOTOLUMINESCENCE PROPERTIES
   INORGANIC-COMPOUNDS
   EMISSION COLOR
   FULL-COLOR
   DIODES
   Eu2+
   IONS
   LEDS
   Tb
Аннотация: A new blue-emitting phosphor Li3Sc2(PO4)3:Eu2+ was synthesized by a high temperature solid-state reaction method, and the crystal structure and photoluminescence properties were investigated in detail. The preferred crystallographic position of the Eu2+ ions in the Li3Sc2(PO4)3 host were determined from the structural analysis and spectroscopic properties. The as-prepared phosphor gave an intense blue emission band centered at 439 nm with the CIE coordinate of (0.1540, 0.0317) upon the excitation of the near ultraviolet light. The critical quenching concentration of Eu2+ in Li3Sc2(PO4)3:Eu2+ was about 15 mol%, and the corresponding concentration quenching mechanism was verified to be the dipole-quadrupole interaction. The fluorescence lifetime of Eu2+ emission and the thermal stable luminescence property have been investigated. Li3Sc2(PO4)3:Eu2+ was found to be a promising candidate as a blue-emitting n-UV convertible phosphor for the application in white light emitting diodes (w-LEDs).

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielectr Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Yu, Shixin; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Miao, Hao; Atuchin, V. V.
}
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    Geng, K.
    Crystal structure and luminescence property of a novel blue-emitting Cs2xCa2xGd2(1−x)(PO4)2:Eu2+ (x = 0.36) phosphor / K. Geng, Z. G. Xia, M. S. Molokeev // Dalton Trans. - 2014. - Vol. 43, Is. 37. - P. 14092-14098, DOI 10.1039/c4dt01578a. - Cited References: 29. - This present work was supported by the National Natural Science Foundation of China (grant no. 51002146, no. 51272242), Natural Science Foundation of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), the Fundamental Research Funds for the Central Universities (2011YYL131), Beijing Nova Program (Z131103000413047) and Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства нового синего люминофора Cs2xCa2xGd2(1-x)(PO4)2:Eu2+ (x = 0.36)

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
ENERGY-TRANSFER
   DIODES
   EARTH
   EU-2+
   PHASE
   IONS
Аннотация: A novel blue-emitting double-phosphate phosphor Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ was synthesized by the sol-gel method, and the structure and luminescence properties were investigated in detail. The crystal structure and chemical composition of Cs0.72Ca0.72Gd1.28(PO4)(2) matrix was analyzed and determined based on Rietveld refinements and phase and chemical composition analysis. The composition-optimized Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ exhibited strong blue light, peaking at 462 nm upon excitation at 365 nm with the CIE coordinates of (0.139, 0.091). The quenching concentration of Eu2+ in the Cs0.72Ca0.72Gd1.28(PO4)(2) phase was about 0.01 and attributed to the dipole-quadrupole interaction. The thermally stable luminescence properties, fluorescence decay curves and diffuse reflectance spectra of Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphors are also discussed, all of which indicate that the Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphor is a promising phosphor for application in white-light UV LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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    Blue-shift of Eu2+ emission in (Ba,Sr)3Lu(PO4)3:Eu2+ eulytite solid-solution phosphors resulting from release of neighbouring-cation-induced stress / Z. Y. Wang [et al.] // Dalton Trans. - 2014. - Vol. 43, Is. 44. - P. 16800-16804, DOI 10.1039/c4dt02319f. - Cited References: 16. - The present work was supported by the National Natural Science Foundations of China (grant no. 51002146, no. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). V.V.A. is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Синее смещение излучения Eu2+ в твердых растворах (Ba,Sr)3Lu(PO4)3:Eu2 со структурой эулита, вызванное снятием напряжения, индуцированного соседними катионами

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
TUNABLE COLOR TONE
   EXCITED WHITE LEDS
   CRYSTAL-STRUCTURE
   TEMPERATURE
   IONS
Аннотация: A series of iso-structural eulytite-type (Ba,Sr)(3)Lu(PO4)(3):Eu2+ solid-solution phosphors with different Sr/Ba ratios were synthesized by a solid-state reaction. Crystal structures of (Ba,Sr)(3)Lu(PO4)(3):Eu2+ were resolved by the Rietveld method, which shows an eulytite-type cubic Bi-4(SiO4)(3) structure with cations disordered in a single C-3 site while the oxygen atoms were distributed over two partially occupied sites. The emission peaks of Ba(3-x)SrxLu(PO4)(3):Eu2+ (0

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Wang, Z. Y.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Liu, Q. L.
}
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Val'kov, V. V.
Radiation-induced modification of the temperature dependence of the magnetic susceptibility of a 1D magnet / V. V. Val'kov, M. S. Shustin // JETP Letters. - 2014. - Vol. 100, Is. 7. - P. 455-462, DOI 10.1134/S0021364014190138. - Cited References: 28. - This work was supported by the Russian Foundation for Basic Research, project nos. 12-02-31130, 13-02-00523, and 13-02-98013. . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
   EASY-PLANE
   ARRANGEMENT
   MODEL
   IONS
Аннотация: TThe excitation spectrum of a catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 anisotropic 1D magnet with alternating high-spin and low-spin iron ions has been calculated with the use of the diagrammatic technique for Hubbard operators. This has allowed establishing conformity with the Ising model, for which the magnetic susceptibility has been calculated by the transfer-matrix method. The introduction of a statistical ensemble taking into account the presence of chains with different lengths and iron ions with different spins has allowed describing the modification of the magnetic susceptibility under optical irradiation.

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Публикация на русском языке Вальков, Валерий Владимирович. Модификация температурной зависимости магнитной восприимчивости 1D-магнетика под действием облучения [Текст] / В. В. Вальков, М. С. Шустин // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 100 Вып. 7. - С. 510-517

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [12-02-31130, 13-02-00523, 13-02-98013]
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Formation, characterization and magnetic properties of maghemite γ-Fe2O3 nanoparticles in borate glasses / I. S. Edelman [et al.] // J. Alloys Compd. - 2015. - Vol. 624. - P. 60-67, DOI 10.1016/j.jallcom.2014.11.059. - Cited References: 25. - This work was supported partly by the Russian Foundation for Basic Research - Russia, Grant No. 14-02-01211-a and by the President of Russia Grant No. NSh-2886.2014.2. This work was performed using the equipment of Unique Scientific Facility "Kurchatov Synchrotron Radiation Source'' supported by the Russian Ministry of Science and Education (project code RFMEFI61914X0002). . - ISSN 0925-8388

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
SUPERPARAMAGNETIC RESONANCE
   HYSTERESIS LOOPS
   EXCHANGE BIAS
   IONS
   MATRIX
Кл.слова (ненормированные):
Nanostructures -- Crystal structure and symmetry -- Magnetic measurements
Аннотация: A new type of nanocomposite materials based on maghemite, γ-Fe2O3, nanoparticles dispersed in borate glasses co-doped with low contents of iron together with the larger radius element combinations: Y and Bi, or Sm and Pb, or Y and Pb is studied. Nanoparticles arise as a result of heat treatment of the glasses which gives them properties characteristic of magnetically ordered substances. Transmission electron microscopy and XRD show that only one magnetic phase, namely γ-Fe2O3 nanoparticles, occurs in glasses subjected to the thermal treatment at 540 °C during 24 h independently on the doping element nature. At the same time doping element and their concentrations ratio in every combination affect the particles average size and glass magnetic properties, such as magnetization temperature dependences, Faraday rotation value and electron magnetic resonance spectrum characteristics.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia
NRC Kurchatov Inst, Moscow 123182, Russia
RAS, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Zubavichus, Y. V.; Trofimova, N. N.; Zaikovskii, V. I.; Russian Foundation for Basic Research - Russia [14-02-01211-a]; President of Russia [NSh-2886.2014.2]; Russian Ministry of Science and Education [RFMEFI61914X0002]
}
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Magneto-optical activity of f–f transitions in ErFe3(BO3)4 and ErAl3(BO3)4 single crystals / A. V. Malakhovskii [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 384. - P. 255-265, DOI 10.1016/j.jmmm.2015.02.051. - Cited References: 44. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the President of Russia Grant no. Nsh-2886.2014.2. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
CIRCULAR-DICHROISM SPECTRA
   GREEN UP-CONVERSION
   SPECTROSCOPIC PROPERTIES
   OPTICAL-PROPERTIES
   LASER
   Er3+
   ABSORPTION
   GROWTH
   IONS
   GdFe3(BO3)4
Кл.слова (ненормированные):
Magnetic circular dichroism -- Natural circular dichroism -- Rare earth ferroborates -- Rare earth alumoborates -- Electronic structure
Аннотация: Absorption, magnetic circular dichroism and natural circular dichroism spectra of ErFe3(BO3)4 and ErAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. It was found out that magneto-optical activity of the same f–f transitions in the studied crystals substantially differed and their temperature dependences did not follow the Curie–Weiss law in contrast to the properties of allowed transitions. The observed phenomena were accounted for by the nature of f–f transitions allowance. Properties of the transition 4I15/2→4S3/2 were studied in detail. In particular, the Zeeman splitting and the natural optical activity of the absorption lines composed of the transition were determined. The vibronic line with the very large natural optical activity was revealed and identified. Two nonequivalent Er3+ ion positions with the opposite chirality were found out in one of the excited states. Polarization properties of the 4I15/2→4S3/2 transition in the ErFe3(BO3)4 crystal have shown that the local symmetry of Er3+ ion in this crystal in the range of 90–293 K is lower than the D3 one. From the heat capacity measurements it was revealed, that the first order structural phase transition to lower symmetry occurred in ErFe3(BO3)4 at 433–439 K.
Поглощение, магнитный циркулярный дихроизм и спектры природного кругового дихроизма монокристаллов ErFe3(BO3)4 и ErAl3(BO3)4 были измерены в зависимости от температуры в диапазоне 90-293 К. Было обнаружено, что по магнитооптической активности одни и те жеF-F переходы в исследованных кристаллах существенно отличаются и их температурные зависимости не следовать закону Кюри-Вейсса в отличие от свойств разрешенных переходов. Наблюдаемые явления были учтены по характеру F-Fпереходов. Свойства перехода 4I15 / 2 → 4S3 / 2 были детально изучены. В частности, расщепление Зеемана и явление естественной оптической активности линий поглощения, состоящих в переходе были полны решимости. Вибронная линия очень большой естественной оптической активности выявлена и идентифицирована. Две неэквивалентных позиций ионовEr3 + с противоположной хиральности были найдены в одном из возбужденных состояний. Поляризационные свойства 4I15 / 2 → 4S3 / 2 перехода в ErFe3(BO3)4 кристалла показали, что локальная симметрия ионов Er3 + в этом кристалле в диапазоне 90-293 К ниже, чем D3. Из измерений теплоемкости Было обнаружено, что структурный фазовый переход первого типа к более низкой симметрии произошел в ErFe3(BO3) 4 при 433-439 К. Ключевые слова: Магнитный круговой дихроизм; Природные круговой дихроизм; Редкоземельные ферроборатов; Редкоземельныеalumoborates; Электронная структура; 44 источника.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, V. V.; Соколов В. В.; Kutsak, T. V.; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Researches [12-02-00026]; President of Russia Grant [Nsh-2886.2014.2]
}
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10.

    Chemical unit cosubstitution and tuning of photoluminescence in the Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+ phosphor / Z. Xia [et al.] // J. Am. Chem. Soc. - 2015. - Vol. 137, Is. 39. - P. 12494-12497, DOI 10.1021/jacs.5b08315. - Cited References: 24. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51572023 and 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), and the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS (RERU2015022). C.M. acknowledges financial support from National Natural Science Foundation of China (Grant No. 11204393), Natural Science Foundation Project of Chongqing (Grant No. CSTC2014JCYJA50034), and National Training Programs of Innovation and Entrepreneurship for Undergraduates (Grant No. 201410617001). K.R. recognizes that this material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1324585. . - ISSN 0002-7863
   Перевод заглавия: Со-замещение химической группы и регулирование фотолюминесценции в люминофоре Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+

РУБ Chemistry, Multidisciplinary
Рубрики:
LUMINESCENCE PROPERTIES
TRANSITIONS
IONS
Аннотация: The union of structural and spectroscopic modeling can accelerate the discovery and improvement of phosphor materials if guided by an appropriate principle. Herein, we describe the concept of chemical unit cosubstitution as one such potential design scheme. We corroborate this strategy experimentally and computationally by applying it to the Ca2(Al1-xMgx)(Al1-xSi1+x)O7:Eu2+ solid solution phosphor. The cosubstitution is shown to be restricted to tetrahedral sites, which enables the tuning of luminescent properties. The emission peaks shift from 513 to 538 nm with a decreasing Stokes shift, which has been simulated by a crystal-field model. The correlation between the 5d crystal-field splitting of Eu2+ ions and the local geometry structure of the substituted sites is also revealed. Moreover, an energy decrease of the electron-phonon coupling effect is explained on the basis of the configurational coordinate model. © 2015 American Chemical Society.

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School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Department of Chemistry, Northwestern University, Evanston, IL, United States

Доп.точки доступа:
Xia, Zhiguo; Ma, C.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.; Rickert, K.; Poeppelmeier, K. R.
}
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11.

    Effects of composition modulation on the luminescence properties of Eu3+ doped Li1-xAgxLu(MoO4)2 solid-solution phosphors / F. Cheng [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 41. - P. 18078-18089, DOI 10.1039/c5dt02760h. - Cited References: 42. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51272242, 51572023, 51511130035), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (RERU2015022), and the excellent tutor section of the Fundamental Research Funds for the Central Universities of China University of Geosciences, Beijing (2-9-2015-028). This work was also partly supported by the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). . - ISSN 1477-9226
   Перевод заглавия: Влияние модуляции состава на люминесцентные свойства твердотельного люминофора Li1-xAgxLu(MoO4)2 допированного Eu3+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
RED PHOSPHORS
   PHOTOLUMINESCENCE PROPERTIES
   ENERGY-TRANSFER
   WHITE LEDS
   IONS
   NA
   POLYMORPHISM
   TUNGSTATES
   RELAXATION
   MOLYBDATES
Аннотация: Double molybdate scheelite-type solid-solution phosphors Li1−xAgxLu1−y(MoO4)2:yEu3+ were synthesized by the solid state reaction method, and their crystal structures and luminescence properties were investigated in detail. The composition modulation and structural evolution of this series of samples were studied and the selected AgEu(MoO4)2, AgLu(MoO4)2, LiLu(MoO4)2 and LiEu(MoO4)2 phases were analyzed based on the Rietveld refinement. Depending on the variation of the Li/Ag ratio in Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors, the difference in the luminescence properties of Li1−xAgxLu1−y(MoO4)2:yEu3+ phosphors was ascribed to two factors, one reason could be assigned to the coupling effect and the nonradiative transition between the energy levels of LixAg1−xLu(MoO4)2 matrices and the activator Eu3+, another could be due to the near ultraviolet energy absorption and transmission efficiency between the charge-transfer (CT) band of O2−–Mo6+ and the 4f → 4f emissive transitions of Eu3+. The ultraviolet-visible diffuse reflection spectra (UV-vis DRS) and Raman spectra analysis were also used to verify the above mechanism.

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Держатели документа:
School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China

Доп.точки доступа:
Cheng, F.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jing, X.
}
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12.

    Engineering oxygen vacancies towards self-activated BaLuAlxZn4-xO7-(1-x)/2 photoluminescent materials: An experimental and theoretical analysis / L. Ma [et al.] // Phys. Chem. Chem. Phys. - 2015. - Vol. 17, Is. 46. - P. 31188-31194, DOI 10.1039/c5cp05130d. - Cited References: 28. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51572023, 51272242 and 51511130035), and Fundamental Research Funds for the Central Universities (FRF-TP-15-005A1). The author A. H. Reshak would like to acknowledge the CENTEM project, reg. no. CZ.1.05/2.1.00/03.0088, cofunded by the ERDF as part of the Ministry of Education, Youth and Sports OP RDI programme and, in the follow-up sustainability stage, supported through CENTEM PLUS (LO1402) by financial means from the Ministry of Education, Youth and Sports under the National Sustainability Programme I. Computational resources were provided by MetaCentrum (LM2010005) and CERIT-SC (CZ.1.05/3.2.00/08.0144) infrastructures. SA would like to thank CSIR-NPL and Physics Department IIT Delhi for financial support. This work was partly supported by the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). VVA was partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1463-9076
   Перевод заглавия: Разработка кислородных вакансий для самоактивируемых люминесцентных материалов BaLuAlxZn4-xO7-(1-x)/2: экспериментальный и теоретический анализ

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
PHOSPHOR
   LUMINESCENCE
   EVOLUTION
   OXIDES
   IONS
Аннотация: Novel self-activated yellow-emitting BaLuAlxZn4-xO7-(1-x)/2 photoluminescent materials were investigated by a combined experimental and theoretical analysis. The effects of Al/Zn composition modulation, calcination atmosphere and temperature on the crystal structure and photoluminescence properties have been studied via engineering oxygen vacancies. Accordingly, BaLuAl0.91Zn3.09O7 prepared in an air atmosphere was found to be the stable crystalline phase with optimal oxygen content and gave a broad yellow emission band with a maximum at 528 nm. The self-activated luminescence mechanism is ascribed to the O-vacancies based on the density functional theory (DFT) calculation. A theoretical model originating from the designed oxygen vacancies has been proposed in order to determine the influence of O-vacancies on the band structure and self-activated luminescence. Therefore, the appearance of a new local energy level in the band gap will cause the wide-band optical transitions in the studied BaLuAlxZn4-xO7-(1-x)/2 materials.

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School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Council of Scientific and Industrial Research-National Physical Laboratory Dr K S Krishnan Marg, New Delhi, India
Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi, India
New Technologies-Research Centre, University of West Bohemia, Univerzitni 8, Pilsen, Czech Republic
Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, Kangar, Perlis, Malaysia

Доп.точки доступа:
Ma, L.; Xia, Z.; Atuchin, V. V.; Атучин, Виктор Валерьевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Auluck, S.; Reshak, A. H.; Liu, Q.
}
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13.

Val'kov, V. V.
Quantum renormalizations in anisotropic multisublattice magnets and the modification of magnetic susceptibility under irradiation / V. V. Val'kov, M. S. Shustin // J. Exp. Theor. Phys. - 2015. - Vol. 121, Is. 5. - P. 860-877, DOI 10.1134/S1063776115110175. - Cited References:46. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523, 14-02-31237, and 15-42-04372 . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
   GLAUBER MODEL
   EASY-PLANE
   ARRANGEMENT
   SYSTEMS
   IONS
Аннотация: The dispersion equation of a strongly anisotropic one-dimensional magnet catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 containing alternating high-spin (HS) (S = 2) and low-spin (LS) (S = 1/2) iron ions is obtained by the diagram technique for Hubbard operators. The analysis of this equation yields six branches in the excitation spectrum of this magnet. It is important that the crystal field for ions with spin S = 2 is described by the Hamiltonian of single-ion easy-plane anisotropy, whose orientation is changed by 90° when passing from one HS iron ion to another. The U(N) transformation technique in the atomic representation is applied to diagonalize a single-ion Hamiltonian with a large number of levels. It is shown that the modulation of the orientation of easy magnetization planes leads to a model of a ferrimagnet with easy-axis anisotropy and to the formation of energy spectrum with a large gap. For HS iron ions, a decrease in the mean value of the spin projection due to quantum fluctuations is calculated. The analysis of the specific features of the spectrum of elementary excitations allows one to establish a correspondence to a generalized Ising model for which the magnetic susceptibility is calculated in a wide range of temperatures by the transfer-matrix method. The introduction of a statistical ensemble that takes into account the presence of chains of different lengths and the presence of iron ions with different spins allows one to describe the experimentally observed modification of the magnetic susceptibility of the magnet under optical irradiation.

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Публикация на русском языке Вальков, Валерий Владимирович. Квантовые ренормировки в анизотропных многоподрешеточных магнетиках и модификация магнитной восприимчивости при облучении [Текст] / В. В. Вальков, М. С. Шустин // Журнал экспериментальной и теоретической физики : Наука, 2015. - Т. 148 Вып. 5. - С. 984-1004

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 14-02-31237, 15-42-04372]
}
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14.

Giant natural circular dichroism of vibronic transitions in HoAl3(BO3)4 / A. V. Malakhovskii [et al.] // JETP Letters. - 2015. - Vol. 102, Is. 8. - P. 493-495, DOI 10.1134/S0021364015200084. - Cited References: 15. - This work was supported by the Council of the President of the Russian Federation for the Support of Leading Scientific Schools (project no. NSh-2886.2014.2). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CRYSTAL
   OPTICAL-ABSORPTION
   SPECTRA
   Ho3+
   IONS
   PR3+
Аннотация: The giant natural optical activity of vibronic replicas of the f–f5/8 → 5F2 transition in HoAl3(BO3)4 is observed. It exceeds the optical activity related to purely electronic transitions by two orders of magnitude and corresponds to the almost complete circular polarization of the transitions. This effect is explained by the local distortions of the crystal in the excited electronic state, which lead to the mixing of electron and vibrational wavefunctions and, as a consequence, to the delocalization of the vibronic wavefunction and the enhancement of spatial dispersion, which is responsible for the optical activity.

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Публикация на русском языке Гигантский естественный круговой дихроизм вибронных переходов в HoAl3(BO3)4 [Текст] / А. В. Малаховский [и др.] // Письма в ЖЭТФ : Наука, 2015. - Т. 102 Вып. 8. - С. 555-557

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, V. V.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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15.

    Preparation and luminescence properties of the blue-emitting phosphor BaBPO5:Eu2+ / L. Zhang [et al.] // Sci. Adv. Mater. - 2016. - Vol. 8, Is. 5. - P. 1086-1092, DOI 10.1166/sam.2016.2704. - Cited References: 22. - This work was financially supported by the National Natural Science Foundation of China (NSFC Grant no. 51172216) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015022). . - ISSN 1947-2935
   Перевод заглавия: Синтез и люминесцентные свойства синего люминофора BaBPO5:Eu2+

РУБ Nanoscience & Nanotechnology + Physics, Applied + Physics, Applied
Рубрики:
Energy-transfer
   Diodes
   Ions
   Eu3+
   Photoluminescence
   Reduction
   Tb3+
Кл.слова (ненормированные):
BaBPO5 -- Eu2+ -- Phosphor -- White light emitting diodes
Аннотация: Blue-emitting BaBPO5:xEu2+ phosphors were prepared by a high-temperature solid-state reaction route. The crystal phase, luminescence properties, lifetime, and thermal stability were investigated, respectively. The phase analysis indicated that BaBPO5 crystallize with the structure of stillwellite-type compounds. Under the excitation at 310 nm, the phosphor exhibited an asymmetric broad-band blue emission with peak at 410 nm, which was ascribed to the 4f-5d transition of Eu2+. It was further calculated that the dipole-dipole interactions were responsible for a concentration quenching effect in BaBPO5:xEu2+ phosphors at x = 0.08. The lifetime decreased with the increasing concentration of Eu2+ ions. The temperature-dependent emission spectra indicated an excellent thermal stability of the BaBPO5:0.08Eu2+ samples. Surface morphology and CIE coordinate were also investigated. All the properties assessed indicated that the developed blue-emitting BaBPO5:Eu2+ phosphor is a good candidate for application in white-light emitting diodes. © 2016 by American Scientific Publishers.

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Держатели документа:
School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing), Beijing, China
National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co., Ltd., Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Zhang, L.; Fang, M.; Huang, Z.; Liu, Y.; Min, X.; Tang, H.; Chen, K.; Guan, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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16.

    A novel single-phase white light emitting phosphor Ca9La(PO4)5(SiO4)F2:Dy3+: Synthesis, crystal structure and luminescence properties / H. Liu [et al.] // RSC Adv. - 2016. - Vol. 6, Is. 29. - P. 24577-24583, DOI 10.1039/c5ra23348h. - Cited References: 33. - We gratefully acknowledge the financial support by the National Natural Science Foundations of China (Grant no. 41172053), the Fundamental Research Funds for the Central Universities (Grant no. 2652013043), and Science and Technology Innovation Fund of the China University of Geosciences (Beijing). . - ISSN 2046-2069
   Перевод заглавия: Новый однофазный люминофор Ca9La(PO4)5(SiO4)F2:Dy3+, излучающий белый свет: синтез, кристаллическая структура и люминесцентные свойства

РУБ Chemistry, Multidisciplinary
Рубрики:
Energy-transfer
   Diodes
   LEDs
   Emission
   Ions
   Excitation
   Ce3+
   Eu2+
   Ln
Аннотация: A novel single-phase white light emitting phosphor Ca9La(PO4)5(SiO4)F2:Dy3+ was prepared through traditional high-temperature solid state technology. The crystal structures of Ca9La(PO4)5(SiO4)F2 with or without Dy3+ ions were refined by the Rietveld method. The diffuse reflection spectra, excitation spectra, emission spectra, and decay times were characterized to investigate the photoluminescence properties for application in white light-emitting diodes. The results showed that the Ca9La(PO4)5(SiO4)F2:Dy3+ phosphor could efficiently assimilate n-UV light and emit blue (∼485 nm) and yellow light (∼580 nm), originating from the f-f transitions of Dy3+. The critical Dy3+ quenching concentration (QC) was determined to be about 15 mol%, and the corresponding QC mechanism was verified to be the dipole-dipole interaction. Additionally, the emission colors of all samples were located close to the ideal white light region, and the optimal chromaticity coordinates and correlated color temperature (CCT) were determined to be (x = 0.338, y = 0.336) and 5262 K. All the above results indicate that the as-prepared Ca9La(PO4)5(SiO4)F2:Dy3+ phosphor could serve as a promising candidate for white-light n-UV-LEDs. © The Royal Society of Chemistry 2016.

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Держатели документа:
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, China
Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Liu, H.; Liao, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Guo, Q.; Zhang, Y.; Mei, L.
}
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17.

Magnetic and natural optical activity of f–f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4 / A. V. Malakhovskii [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 5. - P. 952-958, DOI 10.1134/S1063783416050152. - Cited References:29. - This study was supported by the Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools (grant no. NSh-2886.2014.2) and the Russian Foundation for Basic Research (project no. 16-02-00273). . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
Circular-dichroism spectra
   Magnetooptical properties
   Single-crystal
   Absorption
   Ions
   NdFe3(BO3)4
   Nd3+
   Pr3+
   Ho3+
Аннотация: Spectra of absorption, magnetic circular dichroism, and natural circular dichroism of the f–f transitions 4I9/2 → 4F3/2, 2H9/2 + 4F5/2, 4S3/2 + 4F7/2, 2G7/2 + 4G5/2, 2K13/2 + 4G7/2, and 4G9/2 in the Nd3+ ions in the Nd0.5Gd0.5Fe3(BO3)4 crystal have been measured as a function of the temperature in the interval of 90–300 K. Temperature dependences of the magneto-optical activity (MOA) and natural optical activity (NOA) of the transitions have been obtained. It has been found that, in contrast to allowed transitions, the temperature dependence of the MOA of the f–f transitions does not obey the Curie–Weiss law and the NOA depends on temperature. The NOA of some transitions changes the sign with variation in temperature. These phenomena have been explained by the presence of three contributions to the allowance of the f–f transitions, which lead to three contributions of different signs to the MOA and NOA. The range of the MOA of the f–f transitions in the Nd3+ ion has been predicted theoretically and confirmed experimentally.

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Публикация на русском языке Магнитная и естественная оптическая активность f-f- переходов в мультиферроике Nd0.5Gd0.5Fe3(BO3)4 [Текст] / А. В. Малаховский [и др.] // Физ. тверд. тела. - 2016. - Т. 58 Вып. 5. - С. 923–928

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Temerov, V. L.; Темеров, Владислав Леонидович; Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools [NSh-2886.2014.2]; Russian Foundation for Basic Research [16-02-00273]
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18.

    Crystal structure and luminescence properties of novel Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphor with apatite structure / Q. F. Guo [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 10. - P. 11687-11691, DOI 10.1016/j.ceramint.2016.04.086. - Cited References:26. - This present work is supported by the National Natural Science Foundation of China (Grant no. 41172053). . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства нового люминофора Sr10-x(SiO4)3(SO4)3O:xEu2+ со структурой апатита

РУБ Materials Science, Ceramics
Рубрики:
Light-Emitting-Diodes
   Energy-transfer
   Tunable phosphor
   LEDs
   Eu-2+
   Ions
   Ce3+
Кл.слова (ненормированные):
Crystal structure -- Apatite -- Phosphor
Аннотация: In this paper, a series of novel luminescent Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors with apatite structure were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the PL thermal stability were investigated. Sr9.92(SiO4)3(SO4)3O:0.08Eu2+ phosphor exhibits better thermal quenching resistance, retaining the luminance of 66.55% at 150 °C compared with that at 25 °C. The quenching concentration of Eu2+ in Sr10(SiO4)3(SO4)3O was about 0.08 (mol) with the dipole–quadrupole interaction. The Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors exhibited a broad-band green emission at 538 nm upon excitation at 396 nm. The results indicate that Sr10−x(SiO4)3(SO4)3O:xEu2+ phosphors have potential applications as near UV-convertible phosphors for white-light UV LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Guo, Q. F.; Ma, B.; Liao, L. B.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mei, L. F.; Liu, H. K.
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19.

Origin of color centers in the flux-grown europium gallium garnet / A. S. Aleksandrovsky [et al.] // J. Appl. Phys. - 2008. - Vol. 103, Is. 8. - Ст. 83102, DOI 10.1063/1.2902365. - Cited References: 7 . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
SPECTRA
IONS
Кл.слова (ненормированные):
Absorption -- Europium alloys -- Garnets -- Ultraviolet radiation -- Calcium-free flux -- Flux-grown europium gallium garnet -- Color centers
Аннотация: Europium gallium garnet (EuGG) single crystals were grown from fluxes with various contents. Optical absorption spectra of EuGG grown from a flux containing calcium show an additional band in the ultraviolet and blue regions of the spectra as compared to the case of a calcium-free flux. Mossbauer spectra of the samples grown from the fluxes with different additives show no signs of other valence states of the europium ions except for 3+. However, they indicate changes in the crystal field due to the entrance of additive ions. The nature of the additional absorption must be the same as that for calcium-doped gadolinium gallium garnet, i.e., anion vacancies. Mossbauer isotope shifts and quadrupole splitting for EuGG are determined. (C) 2008 American Institute of Physics.

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Держатели документа:
[Aleksandrovsky, A. S.
Arkhipkin, V. G.
Bezmaternykh, L. N.
Gudim, I. A.
Krylov, A. S.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Aleksandrovsky, A. S.
Arkhipkin, V. G.
Bezmaternykh, L. N.
Gudim, I. A.
Krylov, A. S.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
[Vagizov, F.] Texas A&M Univ, Dept Phys, College Stn, TX 77840 USA
ИФ СО РАН
L. V. Kirensky Institute of Physics, Siberian Federal University, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Department of Physics, Texas A and M University, College Station, TX 77840, United States

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Krylov, A. S.; Крылов, Александр Сергеевич; Vagizov, F.
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20.

Magneto-optical properties of Dy3+ in oxide glasses: The origin of the magneto-optical activity of f-f transitions and its anomalous temperature dependence / A. V. Malakhovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 701-707, DOI 10.1134/S1063783407040178. - Cited References: 28 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC CIRCULAR-DICHROISM
   FLUOROZIRCONATE ZBLAN GLASS
   OPTICAL-ABSORPTION SPECTRA
   DOPED SODA GLASS
   SPECTROSCOPIC PROPERTIES
   FLUOROBORATE GLASSES
   LITHIUM BORATE
   IONS
   PR3+
   GADOLINIUM
Аннотация: The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the H-6(15/2) to F-6 (5/2) and (6)(F (7/2) + H (5/2)) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+ ions associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
SI Vavilov State Opt Inst, St Petersburg 192371, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation
Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 192371, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Isachenko, V. A.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Potseluyko, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Zarubina, T. V.; Edelman, I. S.; Эдельман, Ирина Самсоновна
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