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    The influence of Ca substitution on magnetic and electric properties of GdCoO3- δ cobaltite / N. B. Ivanova [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2011. - Vol. 168-169. - P. 501-504, DOI 10.4028/www.scientific.net/SSP.168-169.501 . - ISSN 1662-9779. - ISSN 978-3-037
   Перевод заглавия: Влияние замещения Ca на магнитные и электрические свойства кобальтита GdCoO3- δ
Аннотация: The polycrystal samples of Gd1-xCaxCoO3-δ with different content of Ca were synthesized by three different techniques: solution method, solid state reaction and a sol-gel method. A study of magnetic and electric properties have been made. It is shown that the magnetic properties of this compound are in a high degree close to the same of the parent GdCoO3 with Co3+ ions being in a low spin state below the room temperature. The conductivity investigation revealed its increase by alkaline-earth substitution typical in rare-earth cobaltites.

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Доп.точки доступа:
Ustinov, V. \ed.\; Ivanova, N. B.; Иванова, Наталья Борисовна; Bartolome, J.; Figueroa, A.; Blasco, J.; Arauzo, A.; Platunov, M. S.; Платунов, Михаил Сергеевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Kazak, N. V.; Казак, Наталья Валерьевна; Euro-Asian Symposium "Trends in MAGnetism"(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg)
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Эволюция мессбауэровских спектров людвигита Co3-xFexО2BO3 при замещении кобальта железом / Ю. В. Князев [и др.] // Физ. тверд. тела. - 2013. - Т. 55, Вып. 6. - С. 1088-1092. - Работа вып. при поддержке грантов РФФИ № 12-02-00175-а. - 12-02-90410-Укр-а. - 12-02-31543-мол-а. - гранта Президента НШ-1044.2012.2. - программы СО РАН № 38. - Фед. целевой прогр. ”Науч. и науч.-пед. кадры инновационной России 2009−2013 гг."
Аннотация: Синтезирован концентрационный ряд монокристаллов железо-кобальтовых людвигитов Co3-xFexO2BO3 (x= 0.0125, 0.025, 0.050, 0.10, 1.0). Проведены структурные исследования с помощью рентгеновской дифракции и эффекта Мессбауэра. Обнаружен предпочтительный характер заселения железом неэквивалентных кристаллографических позиций в структуре людвигита. Определена валентность замещающих ионов железа, равная трем. Для Co2FeO2BO3 выявлено усложнение структуры gamma-резонансного спектра, обусловленное композиционным беспорядком в системе.

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Переводная версия Evolution of the mossbauer spectra of ludwigite Co3-xFexO2BO3 with substitution of iron for cobalt. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Князев, Юрий Владимирович; Knyazev, Yu. V.; Иванова, Наталья Борисовна; Ivanova, N.B.; Баюков, Олег Артемьевич; Bayukov, O. A.; Казак, Наталья Валерьевна; Kazak, N.V.; Безматерных, Леонард Николаевич; Bezmaternykh, L. N.; Васильев, Александр Дмитриевич; Vasiliev, A. D.
}
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Suppression of the long-range magnetic order in Pb-3(Mn1-xFex)(7)O-15 upon substitution of Fe for Mn / N. V. Volkov [et al.] // J. Magn. Magn. Mater. - 2013. - Vol. 342. - P. 100-107, DOI 10.1016/j.jmmm.2013.04.054. - Cited References: 20. - The study was supported by the Ministry of Education and Science of Russian Federation, Project no. 8365 by the Siberian Branch of the Russian Academy of Sciences, integration Project nos. 29 and 2.5.2. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
PROFILE REFINEMENT
CRYSTAL-STRUCTURE
PB3MN7O15
Кл.слова (ненормированные):
Crystal growth -- Ferrimagnetism -- Layered magnetic compounds
Аннотация: Structure and magnetic properties of Pb-3(Mn1-xFex)(7)O-15 single crystals with x=0-0.2 grown by spontaneous crystallization from solution in melt have been investigated. All the crystals belong to the hexagonal space group P6(3)/mcm. The magnetic properties appeared to be strongly dependent on the iron doping level. At small (x=0.05) dopant concentrations, the value of magnetization and Neel temperature T-N decrease insignificantly (T-N=70 K). With increasing x, the three-dimensional magnetic ordering does not occur and temperature dependences of magnetization at x >= 0.1 exhibit spin-glass-like features in the low-temperature region. (c) 2013 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660046, Russia
ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Sablina, K. A.; Саблина, Клара Александровна; Solov'ev, L. A.; Соловьев, Леонид Александрович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Osetrov, E. I.; Осетров, Е. И.; Schefer, J.; Keller, L.; Boehm, M.
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Evolution of the mossbauer spectra of ludwigite Co3-xFexO2BO3 with substitution of iron for cobalt / Y. V. Knyazev [et al.] // Phys. Solid State. - 2013. - Vol. 55, Is. 6. - P. 1175-1179, DOI 10.1134/S1063783413060176 . - ISSN 1063-7834
Аннотация: A concentration series of single crystals of iron-cobalt ludwigites Co3-xFexO2BO3 (x = 0.0125, 0.025, 0.050, 0.10, 1.0) has been synthesized. The structure has been studied using X-ray diffraction and Mossbauer effect. A preferred occupation of nonequivalent crystallographic positions by iron in the ludwigite structure has been revealed. It has been found that the valence of substituting iron ions is three. It has been revealed that the structure of the ?-resonance spectrum of Co2FeO2BO3 is complicated due to a composition disorder in the system. В© 2013 Pleiades Publishing, Ltd.

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Публикация на русском языке Эволюция мессбауэровских спектров людвигита Co3-xFexО2BO3 при замещении кобальта железом // Физика твердого тела. - 2013. - Т. 55, Вып. 6. - С. 1088-1092

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

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Ivanova, N. B.; Иванова, Наталья Борисовна; Bayukov, O. A.; Баюков, Олег Артемьевич; Kazak, N. V.; Казак, Наталья Валерьевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич
}
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Магнитные свойства ферробората Nd0.95Dy0.05Fe3(BO3)4 с малым замещением в редкоземельной подсистеме / А. И. Бегунов [и др.] // Журн. эксперимент. и теор. физ. - 2013. - Т. 144, Вып. 5. - С. 990-1003DOI 10.7868/S0044451013110102. - Исследование выполнено при финансовой поддержке РФФИ (грант № 12-02-31007 мол_а) и гранта МК-1700.2013.2 Президента РФ
Аннотация: Экспериментально и теоретически исследованы магнитные свойства монокристалла ферробората замещенного состава Nd0.95Dy0.05Fe3(BO3)4 с конкурирующими обменными Nd-Fe- и Dy-Fe-взаимодействиями. Обнаружены спонтанный спин-переориентационный переход вблизи T=4.3 К и аномалии на низкотемпературных кривых намагничивания вдоль тригональной оси c и в базисной плоскости ab. Измеренные свойства и обнаруженные эффекты проинтерпретированы в рамках единого теоретического подхода, который базируется на приближении молекулярного поля и расчетах в модели кристаллического поля для редкоземельного иона. Описаны экспериментальные температурные зависимости начальной магнитной восприимчивости от 2 до 300 К, аномалии на кривых намагничивания при B ll c и B⊥ c в полях до 1.5 Тл, а также полевые и температурные зависимости намагниченности в полях до 9 Тл. Проанализировано влияние малого замещения в редкоземельной подсистеме на магнитные свойства. При интерпретации экспериментальных данных определены параметры кристаллического поля и параметры обменных R-Fe- и Fe-Fe-взаимодействий.

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Переводная версия Magnetic properties of the Nd0.95Dy0.05Fe 3(BO3)4 ferroborate with small substitution in the rare-earth element subsystem. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Бегунов, А. И.; Демидов, А. А.; Гудим, Ирина Анатольевна; Gudim, Irina, A.; Еремин, Евгений Владимирович; Eremin, E. V.
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Magnetic properties of the Nd0.95Dy0.05Fe 3(BO3)4 ferroborate with small substitution in the rare-earth element subsystem / A. I. Begunov [et al.] // J. Exp. Theor. Phys. - 2013. - Vol. 117, Is. 5. - P. 862-874, DOI 10.1134/S1063776113120108 . - ISSN 1063-7761
Аннотация: The magnetic properties of a substituted Nd0.95Dy 0.05Fe3(BO3)4 ferroborate single crystal with competing Nd-Fe and Dy-Fe exchange interactions are studied experimentally and theoretically. A spontaneous spin-reorientation transition is detected near T = 4.3 K, and anomalies are observed in the low-temperature magnetization curves along trigonal axis c and in basal plane ab. The measured properties and the detected effects are interpreted in terms of a general theoretical approach, which is based on the molecular field approximation and crystal field calculations for a rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility in the range 2-300 K, the anomalies in the magnetization curves for B â€- c and B âŠ¥ c in fields up to 1.5 T, and the field and temperature dependences of magnetization in fields up to 9 T are described. The effect of small substitution in the rare-earth subsystem on the magnetic properties is analyzed. The crystal field parameters and the parameters of the R-Fe and Fe-Fe exchange interactions are determined from the experimental data.

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Публикация на русском языке Магнитные свойства ферробората Nd0.95Dy0.05Fe3(BO3)4 с малым замещением в редкоземельной подсистеме. - [S. l. : s. n.]

Держатели документа:
Bryansk State Tech Univ, Bryansk 241035, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660038, Russia

Доп.точки доступа:
Begunov, A. I.; Demidov, A. A.; Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович
}
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The effect of halogen substitution on the structure and electronic spectra of fluorone dyes / E. A. Slyusareva [et al.] // Opt. Spectrosc. - 2012. - Vol. 112, Is. 5. - P. 671-678, DOI 10.1134/S0030400X12040194. - Cited References: 44. - This work was supported by the FTsP Kadry GK-P333 and by the Siberian Branch of the Russian Academy of Sciences (Integration project no. 2). We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences (Moscow) and to the Complex of High-Performance Computations of the IKIT of Siberian Federal University. E. A. Slyusareva acknowledges support from the German Academic Exchange Service and the Ministry of Education and Science of the Russian Federation (the program "Mikhail Lomonosov II") of scientific research at the University of Regensburg and in the Helmholtz Center in Berlin (Germany). . - ISSN 0030-400X

РУБ Optics + Spectroscopy
Рубрики:
POLARIZABLE CONTINUUM MODEL
   BORIC-ACID GLASS
   XANTHENE DYES
   FLUORESCEIN DERIVATIVES
   DELAYED FLUORESCENCE
   EOSIN-Y
   ABSORPTION
   PHOSPHORESCENCE
   TRANSITIONS
   EXCITATION
Аннотация: By means of the B3LYP density functional method with the use of the polarized continuum model PCM, we have performed quantum-chemical computations of the electronic absorption and fluorescence spectra of fluorone dianions: fluorescein, dibromofluorescein, eosin, erythrosine, and Rose Bengal in vacuum and methanol. We have revealed conformational features of the structure of fluorone dianions (charge redistribution, changes in the bond lengths and angles between bonds) second by the halogen substitution, the transition from the ground state to an excited state, and the change of the solvent (vacuum-methanol). Absorption and fluorescence wavelengths, constant dipole moments, transition dipole moments, and oscillator strengths have been calculated. We have showed that, upon halogenation of fluorones, the absorption spectra are redshifted and the Stokes shift decreases, which is qualitatively consistent with experimental results.

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Публикация на русском языке Влияние галогензамещения на структуру и электронные спектры флуороновых красителей [Текст] / Е. А. Слюсарева [и др.] // Оптика и спектроскопия : Наука, 2012. - Т. 112 № 5. - С. 729-737

Держатели документа:
[Slyusareva, E. A.
Tomilin, F. N.
Sizykh, A. G.
Tankevich, E. Yu.
Kuzubov, A. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Tomilin, F. N.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Slyusareva, E. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Sizykh, A. G.; Tankevich, E. Y.; Kuzubov, A. A.; Кузубов, Александр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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    Photoluminescence tuning via cation substitution in oxonitridosilicate phosphors: DFT calculations, different site occupations, and luminescence mechanisms / G. Li [et al.] // Chem. Mater. - 2014. - Vol. 26, Is. 9. - P. 2991-3001, DOI 10.1021/cm500844v. - Cited References: 62. - The authors would like to thank the Ministry of Science and Technology of Taiwan (Contract No. MOST 101-2113-M-002-014-MY3), the National Synchrotron Radiation Research Center, Taiwan, the National Natural Science Foundation of China (Grant No. NSFC 21301162), and the Fundamental Research Funds for the Central Universities (Grant No. CUG 130402) for financially supporting this research. Victor V. Atuchin gratefully acknowledges the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Управление фотолюминесценцией посредством замещения катионов в оксонитридосиликатных люминофорах: ТФП вычисления, заселения различных позиций и механизмы люминесценции

РУБ Chemistry, Physical + Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   HIGH-TEMPERATURE SYNTHESIS
   LED CONVERSION PHOSPHORS
   CRYSTAL X-RAY
   WHITE-LIGHT
   ORDERED DISTRIBUTION
   GREEN PHOSPHOR
   LAYERED OXONITRIDOSILICATE
   REAL STRUCTURE
   AB-INITIO
Аннотация: Tuning and optimizing luminescent properties of oxonitridosilicates phosphors are important for white light-emitting diode (WLED) applications. To improve the color rendering index, correlated color temperature and thermal stability of layer-structured MSi2O2N2:Eu (M = Sr, Ba) phosphors, cation substitutions have been used to adjust their luminescent properties. However, the underlying mechanisms are still unclear. In this research, a series of (Sr1-xBax)Si2O2N2:Eu (0 ≤ x ≤ 1) compounds were prepared by solid-state reaction, after which systematic emission variations were investigated. The crystal structures of (Sr1-xBax)Si2O2N2:Eu (0 ≤ x ≤ 1) are nominally divided into three sections, namely, Phase 1 (0 ≤ x ≤ 0.65), Phase 2 (0.65 x 0.80), and Phase 3 (0.80 ≤ x ≤ 1) based on the X-ray diffraction measurements. These experimental results are further confirmed by optimizing the crystal structure data with first-principle calculations. Continuous luminescence adjustments from green to yellow are observed in Phase 1 with gradual replacement of Sr2+ with Ba2+, and the abnormal redshift is clarified through extended X-ray absorption fine structure analysis. Sr(Eu)-O/N bond length shrinkage in local structure causes the redshift emission, and the corresponding luminescence mechanism is proposed. Controllable luminescence in Phase 2 (from blue to white) and Phase 3 (from cyan to yellowish green) are observed. Based on the high-resolution transmission electron microscopy and selected area electron diffraction analysis, the two kinds of luminescence tuning are attributed to phase segregation. This study serves as a guide in developing oxonitride luminescent materials with controllable optical properties based on variations in local coordination environments through cation substitutions.

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Держатели документа:
Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China
SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Univ St Andrews, Sch Chem, EaSTCHEM, St Andrews KY16 9ST, Fife, Scotland
Natl Cent Univ, Ctr Neutron Beam Applicat, Zhongli 320, Taiwan
Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan
Chongqing Univ Posts & Telecommun, Coll Math & Phys, Chongqing 400065, Peoples R China
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Li, G.; Lin, C. C.; Chen, W.-T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Chiang, C.-Y.; Zhou, W.; Wang, C.-W.; Li, W.-H.; Sheu, H.-S.; Chan, T.-S.; Ma, C.; Liu, R.-S.
}
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Zamkova, N. G.
Effect of Ca 2+ ion substitution by the trivalent ions (Sc 3+, In 3+, La 3+, Bi 3+) on the ferroelectric instability in orthorhombic CaTiO3 / N. G. Zamkova, V. I. Zinenko, A. S. Shinkorenko // Ferroelectrics : Special Issue: Professor Wolfgang Kleemann in honor of his 70th birthday. - 2012. - Vol. 426. - P. 132-138, DOI 10.1080/00150193.2012.671657. - Cited References: 9. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00067) . - ISSN 0015-0193. - ISSN 1563-5112

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Кл.слова (ненормированные):
Ferroelectric -- polarization -- lattice dynamics
Аннотация: Vibration frequencies of instable ferroelectric modes, as well as dependencies of crystal energy on ion's displacement amplitudes of these modes in doped compounds Ca1–x A x Ti1–x/4□ x /4O3 (space group Pbmn) with А–Sc3+, In3+, La3+, Bi3+ (□–vacancy) have been calculated in the framework of generalized nonparametric Gordon–Kim model. To compensate excessive positive charge the vacancies were considered to be at Ti4+ sites. Calculations were carried out in the «average» crystal approximation for the impurity concentration x = 0.25. For this purpose 40 atoms’ supercell sets with the different ordering of the heterovalent ions Ca2+ and impurity А3+ have been considered. Every type of impurity has been found to induce ferroelectric instability in doped compounds.

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Держатели документа:
[Zamkova, N. G.
Zinenko, V. I.
Shinkorenko, A. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk, Russia

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Shinkorenko, A. S.; Шинкоренко, Алексей Сергеевич; Замкова, Наталья Геннадьевна
}
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10.

    Cation substitution dependent bimodal photoluminescence in whitlockite structural Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors / H. P. Ji [et al.] // Inorg. Chem. - 2014. - Vol. 53, Is. 20. - P. 11119-11124, DOI 10.1021/ic501679f. - Cited References: 37. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51032007, 51002146, 51272242), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130022110006), the 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 Beijing Youth Excellent Talent Program (YETP0635). V.V.A. acknowledges the Ministry of Education and Science of the Russian Federation for financial support. . - ISSN 0020-1669. - ISSN 1520-510X
   Перевод заглавия: Катион зависимая бимодальная люминесценция в твердом растворе Ca3-xSrx(PO4)2:Eu2+ (0 ˂ x ˂ 2) со структурой витлокита

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
   EFFICIENT ENERGY-TRANSFER
   EMISSION-TUNABLE PHOSPHOR
   EXCITED WHITE LEDS
   CRYSTAL-STRUCTURE
   LUMINESCENCE PROPERTIES
   Mn2+ PHOSPHOR
   COLOR TONE
   PHASE
   Eu2+
Аннотация: Cation substitution dependent tunable bimodal photoluminescence behavior was observed in the Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors. The Rietveld refinements verified the phase purity and whitlockite type crystal structure of the solid solutions. The tunable photoluminescence evolution was studied as a function of strontium content, over the composition range 0.1 ≤ x ≤ 2. In addition to the emission band peak at 416 nm in Ca3(PO4)2:Eu2+, the substitution of Ca2+ by Sr2+ induced the emerging broad-band peak at 493-532 nm. A dramatic red shift of the emission peak located in the green-yellow region was observed on an increase of x in the samples with 0.75 ≤ x ≤ 2.00. The two emission bands could be related to the EuOn-Ca9 and EuOn-Ca9-xSrx emitting blocks, respectively. The values for the two kinds of emitting blocks in the solid solutions can be fitted well with the observed intensity evolution of the two emission peaks.

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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 & Dielect Mat, Novosibirsk 630090, Russia
Univ Auckland, Dept Chem & Mat Engn, Auckland 1142, New Zealand

Доп.точки доступа:
Ji, H. P.; Huang, Z. H.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Huang, S. F.
}
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11.

Structural and electronic parameters of ferroelectric K3WO3F3 / V. V. Atuchin [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 43-44. - P. 2085-2088, DOI 10.1016/j.ssc.2010.09.023. - Cited References: 34. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CORE-LEVEL SPECTROSCOPY
   PHASE-TRANSITIONS
   RHEED ANALYSIS
   SURFACE
   OXYFLUORIDE
   ELPASOLITE
   (NH4)(2)KWO3F3
   SUBSTITUTION
   TEMPERATURE
   DIFFRACTION
Кл.слова (ненормированные):
Ferroelectrics -- Chemical synthesis -- Electronic structure -- Photoelectron spectroscopies
Аннотация: The low-temperature ferroelectric G2 polymorph of K3WO3F3 oxyfluoride is formed by chemical synthesis. The electronic parameters of G2-K3WO3F3 have been measured by X-ray photoelectron spectroscopy under excitation with Al K alpha radiation (1486.6 eV). Detailed spectra have been recorded for all element core levels and Auger lines. The chemical bonding effects in the WO3 F-3 and WO6 octahedrons are considered by using the binding energy difference Delta BE(O-W) = BE(O 1s) BE(W 4f(7/2)). (C) 2010 Elsevier Ltd. All rights reserved.

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[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090, Russia
[Molokeev, M. S.
Aleksandrov, K. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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12.

    Discovery of new solid solution phosphors via cation substitution-dependent phase transition in M-3(PO4)2:Eu2+ (M =Ca/Sr/Ba) quasi-binary sets / H. P. Ji [et al.] // J. Phys. Chem. C. - 2015. - Vol. 119, Is. 4. - P. 2038-2045, DOI 10.1021/jp509743r. - Cited References:48. - This work was supported by the National Natural Science Foundations ofChina (Grant Nos. 51032007, 51002146, and 51272242), the Research Fundfor the Doctoral Program of Higher Education of China (Grant No.20130022110006), the Natural Science Foundations of Beijing (2132050),the Program for New Century Excellent Talents in University of Ministryof Education of China (NCET-12-0950), the Beijing Nova Program(Z131103000413047), and Beijing Youth Excellent Talent Program(YETP0635). V.V.A. acknowledges the Ministry of Education and Science ofthe Russian Federation for financial support. . - ISSN 1932-7447
   Перевод заглавия: Открытие новых твердых растворов люминофоров посредством фазовых переходов при замещении катионов в квазибинарных составах M3(PO4)2:Eu2+ (M = Ca/Sr/Ba)

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
LUMINESCENCE PROPERTIES
ENERGY-TRANSFER
Аннотация: The cation substitution-dependent phase transition was used as a strategy to discover new solid solution phosphors and to efficiently tune the luminescence property of divalent europium (Eu2+) in the M3(PO4)2:Eu2+ (M = Ca/Sr/Ba) quasi-binary sets. Several new phosphors including the greenish-white SrCa2(PO4)2:Eu2+, the yellow Sr2Ca(PO4)2:Eu2+, and the cyan Ba2Ca(PO4)2:Eu2+ were reported, and the drastic red shift of the emission toward the phase transition point was discussed. Different behavior of luminescence evolution in response to structural variation was verified among the three M3(PO4)2:Eu2+ joins. Sr3(PO4)2 and Ba3(PO4)2 form a continuous isostructural solid solution set in which Eu2+ exhibits a similar symmetric narrow-band blue emission centered at 416 nm, whereas Sr2+ substituting Ca2+ in Ca3(PO4)2 induces a composition-dependent phase transition and the peaking emission gets red shifted to 527 nm approaching the phase transition point. In the Ca3?xBax(PO4)2:Eu2+ set, the validity of crystallochemical design of phosphor between the phase transition boundary was further verified. This cation substitution strategy may assist in developing new phosphors with controllably tuned optical properties based on the phase transition.

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China Univ Geosci, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Sch Mat Sci & Technol, Natl Lab Mineral Mat, 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
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, 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:
Ji, Haipeng; Huang, Zhaohui; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Fang, Minghao; Liu, Yangai
}
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13.

    Effect of Al/Si substitution on the structure and luminescence properties of CaSrSiO4:Ce3+ phosphors: analysis based on the polyhedra distortion / S. H. Miao [et al.] // J. Mater. Chem. C. - 2015. - Vol. 3, Is. 18. - P. 4616-4622, DOI 10.1039/c5tc00339c. - Cited References:30. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, 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), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) and the excellent tutor section of the Fundamental Research Funds for the Central Universities of China University of Geosciences, Beijing (2652015027). - Cover image: Artwork representing main idea of this article . - ISSN 2050. - ISSN 2050-7534
   Перевод заглавия: Эффект замещения Al/Si на структуру и люминесцентные свойства люминофора CaSrSiO4:Ce3+. Анализ основанный на искажении полиэдров

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LIGHT-EMITTING-DIODES
COLOR-TUNABLE PHOSPHOR
ENERGY-TRANSFER
Аннотация: Blue-emitting CaSrSiO4:Ce3+,Li+ phosphors were prepared by a high temperature solid-state method, and the effect of substituting Al3+ for Si4+ in CaSrSiO4:Ce3+,Li+ has been studied. Crystal structures of the as-prepared Ca1−ySr1−ySi1−xAlxO4:yCe3+,yLi+ phosphors were resolved by the Rietveld method, which suggested that all the samples belonged to the orthorhombic symmetry (Pnma) group of α-CaSrSiO4. The photoluminescence (PL) emission and excitation spectra, the lifetime, and the effect of Al3+ concentration on the PL properties were investigated in detail. The emission peaks of the CaSrSi1−xAlxO4:Ce3+,Li+ (x = 0–0.10) phosphors were red-shifted from 452 to 472 nm with increasing Al/Si ratio. The red-shift of the Ce3+ emission is ascribed to the polyhedra distortion of the cations, originating from the variation in the neighboring [(Si,Al)O4] polyhedra, and the detailed mechanism has been discussed.

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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.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Miao, Shihai; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, Mingyue; Zhang, Jie; Liu, Quanlin
}
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14.

    Crystal and local atomic structure of MgFeBO4,Mg0.5Co0.5FeBO4, and CoFeBO4: effects of Co substitution / N. V. Kazak [et al.] // Phys. Status Solidi B. - 2015. - Vol. 252, Is. 10. - P. 2245-2258, DOI 10.1002/pssb.201552143. - Cited References: 46. - This work has been financed by the MECOM Project MAT11/23791, and DGA IMANA project E-34, Council for Grants of the President of the Russian Federation (project nos. NSh-2886.2014.2, SP-938.2015.5), and Russian Foundation for Basic Research (project nos. 13-02-00958-a, 13-02-00358-a, 14-02-31051-mol-a). The work of one of the coauthors (M.S.P.) was supported by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere ("UMNIK" program). . - ISSN 0370. - ISSN 1521-3951
   Перевод заглавия: Кристаллическая и локальная атомная структура MgFeBO4, Mg0.5Co0.5FeBO4 and CoFeBO4: эффект замещения Со

РУБ Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
   MAGNETIC WARWICKITES
   SINGLE-CRYSTALS
   PHASE-RELATIONS
   OXYBORATE
   SYSTEM
   SPECTROSCOPY
   ANISOTROPY
   MN2OBO3
   FE2OBO3
Кл.слова (ненормированные):
crystal structure -- XANES -- EXAFS -- magnetic semiconductor -- oxyborate
Аннотация: Single-crystalline MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 have been grown by the ﬂux method. The samples have been characterized by X-ray spectral analysis, X-ray diffraction, and X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) and extended X-ray absorption ﬁne structure (EXAFS) spectra have been measured at the Fe and Co K-edges over a wide temperature range (6.5– 300 K). The composition, the charge state, and local environ- ment of both Fe and Co atoms have been determined. The effects of Co substitution for Mg on the local structural distortions have been revealed experimentally and the M–O bond anisotropy has been found.
Монокристаллические образцы CoFeBO4 были выращены раствор-расплавным методом. Образцы были охарактеризованы с помощью рентгеноспектрального анализа, рентгеновской дифракции и спектроскопии поглощения рентгеновских лучей. Спектры вблизи K-края поглощения рентгеновского излучения структуры (XANES) и далее рентгеновского поглощения тонкой структуры (EXAFS) были измерены для Fe и Co в широком диапазоне температур (6.5- 300К). Состав, состояние заряда, и локальная положение и Fe и Co атомов были определены. Эффекты замещения Co магнием Mg на местные структурные искажения были выявлены экспериментально и анизотропия связи М-О была найдена.

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Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
National Research Center Kurchatov Institute, Moscow, Russian Federation
Servicio de Medidas Fi, sicas, Universidad de Zaragoza, Zaragoza, Spain
Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales de Aragon, CSIC, Universidad de Zaragoza, Zaragoza, Spain
O. O. Galkin Institute for Physics and Engineering, National Academy of Sciences of Ukraine, Donetsk, Ukraine

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Ivanova, N. B.; Иванова, Наталья Борисовна; Zubavichus, Y. V.; Veligzhanin, A. A.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Arauzo, A.; Bartolome, J.; Lamonova, K. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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15.

Удод, Любовь Викторовна.
Влияние катионного замещения на полиморфные переходы в пирасаннате висмута Bi2Sn2O7 / Л. В. Удод, М. Н. Ситников // Вестник СибГАУ. - 2015. - Т. 16, № 4. - С. 975-982. - Библиогр.: 53. - Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований, грант № 15-42-04099 р_сибирь_а, и государственного задания № 114090470016 . - ISSN 1816-9724
Кл.слова (ненормированные):
полиморфные переходы -- диэлектрическая проницаемость -- электросопротивление -- катионное замещение -- дифференциальная сканирующая калориметрия -- polymorphic transitions -- dielectric permeability -- cation substitution -- electrical resistivity -- differential scanning calorimetry
Аннотация: Рассмотрена разработка технологии новых сенсорных материалов, необходимых для газочувствительных приборов, применяемых в ракетостроении. Целью данной работы является изучение влияния допирования разновалентными катионами на кристаллографическую структуру, диэлектрические и электрические свойства пирохлорного соединения Bi 2Sn 2O 7, обладающего селективной избирательностью к газам. Методом твердофазного синтеза впервые синтезированы соединения Bi2(Sn1-xMex)2O7, где Me = Mn, Cr, x = 0, 0,05, находящиеся сразу в двух полиморфных модификациях - орторомбической и кубической. В твердых растворах Bi2(Sn0,95Cr0,05)2O 7 методом сканирующей калориметрии обнаружено два новых структурных перехода, по сравнению со станнатом висмута Bi2Sn2O7. Ионы Mn 4+ сместили фазовые границы полиморфных переходов в сторону меньших температур, а фазовый α→β-переход около 370 К, характерный для Bi2(Sn1-xCrx)2O7, где x = 0, 0,05, подавили почти полностью. Полиморфный переход при Т = 543 К для Bi 2(Sn0,95Mn0,05) 2O 7 протекает с выделением тепла, в отличие от Bi2(Sn1-xCrx)2O7, где x = 0, 0,05. Исследована взаимосвязь структурных, электрических и диэлектрических свойств. Установлены аномалии в температурной зависимости электросопротивления и диэлектрической проницаемости (мнимой и реальной частями) как в области низких температур, так и при высоких температурах. Эти особенности объясняются в рамках модели мартенситных фазовых переходов. Методом сканирующей калориметрии найдены температуры структурных фазовых переходов, которые коррелируют с аномалиями электросопротивления в интервале температур 300 < T < 1000 К для Bi2(Sn1-xCrx)2O7, x = 0, 0,05.
The goal of this work is to develop a new technology of sensor materials required for gas sensing devices used in missile. The aim of this work is to study the effect of doping cations with different valency on the crystallographic structure, dielectric and electrical properties of pyrochlore compound Bi2Sn2O7 with selectivity to gases. Polycrystalline compounds Bi2(Sn1-xMex)2O7, where Me = Mn, Cr, x = 0, 0.05 have been synthesized by conventional solid-state reaction. According to the X-ray powder diffraction research, our sample consists of two polymorphs phases: cubic and rhombic. Two new structural transition are found in Bi2(Sn0.95Cr0.05)2O7 solid solutions by scanning calorimetry, as compared to bismuth pyrostannate Bi2Sn2O7. Ions Mn 4+ leads to shift of phase boundary of polymorphic transitions towards lower temperatures, and the phase α→β-transition at about 370 K, which is characteristic for Bi2(Sn1-xCrx)2O7, where x = 0, 0.05 is suppressed. The polymorphic transition at T = 543 K for Bi2(Sn0.95Mn0.05)2O7 occurs with calorification, in contrast to Bi2(Sn1-xCrx)2 7, where x = 0, 0.05. The relationship between structural, electrical and dielectric properties is investigated. Anomalies in the temperature dependence of electrical resistivity and dielectric permeability (real and imaginary part) as in the low region temperatures as in the high region temperature are found. These features are explained within a model of martensitic phase transitions. The temperature of the structural phase transitions correlates with temperature of maximum of the electrical resistivity in the temperature range 300 < T < 1000 K for Bi2(Sn1-xCrx)2O7, x = 0, 0.05 was found by scanning calorimetry method.

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Ситников, Максим Николаевич; Sitnikov, M.N.; Udod, L. V.
}
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16.

Bi2(Sn0.95Cr0.05)2O7: Structure, IR spectra, and dielectric properties / S. S. Aplesnin [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 4. - P. 5177-5183, DOI 10.1016/j.ceramint.2015.12.040. - Cited References: 45. - This work was supported by the Russian Foundation for Basic Research Projects no. 15-42-04099 r_siberia_a, Siberian Branch of Science and NAS of Belarus “Electronic and magnetic phase transitions in materials with magnetoelectric affect” and government work no. 114090470016. . - ISSN 0272-8842

РУБ Materials Science, Ceramics
Рубрики:
BISMUTH PYROSTANNATE
   PYROCHLORE STRUCTURE
   MAGNETIC-PROPERTIES
   PARTIAL OXIDATION
   HIGH-TEMPERATURE
   X-RAY
   Bi2Sn2O7
   SUBSTITUTION
   CATALYSTS
   DIFFRACTION
Кл.слова (ненормированные):
Bismuth pyrostannate -- Infrared absorption spectra -- Structural transition -- Permittivity -- Debye model
Аннотация: Infrared absorption spectra of the bismuth pyrostannate Bi2(Sn0.95Cr0.05)2O7 were investigated in the frequency range 350-1100 cm-1 at temperatures of 110-525 K. Four frequency regions with split absorption lines are distinguished. Softening of frequencies at the structural transitions was observed. The maxima of permittivity measured in the frequency range 1-200 kHz at temperatures 100-400 K were determined. It was found that the magnetic susceptibility changes its sign in the low-temperature region. The correlation between anomalies in the magnetic susceptibility, permittivity, and absorption line intensity was established. Softening of frequencies is explained by the variation in the coefficient of thermal expansion of the lattice. The temperature behavior of permittivity is described using the Debye model. © 2015 Elsevier Ltd and Techna Group S.r.l.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Akademgorodok 50, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Shestakov, N. P.; Шестаков, Николай Петрович
}
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17.

    Structure and luminescence properties of Eu2+ doped LuxSr2-xSiNxO4-x phosphors evolved from chemical unit cosubstitution / Z. Xia [et al.] // J. Mater. Chem. C. - 2016. - Vol. 4, Is. 6. - P. 1336-1344, DOI 10.1039/c5tc04222d. - Cited References: 32. - This work was supported by the National Natural Science Foundation of China (Grant No. 51572023 and 51272242), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS (RERU2015022), and Fundamental Research Funds for the Central Universities (FRF-TP-15-003A2). . - ISSN 2050-7534
   Перевод заглавия: Структура и люминесцентные свойства люминофора LuxSr2-xSiNxO4-x полученного в результате со-замещения химических блоков и допированного Eu2+

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
SOLID-SOLUTION PHOSPHORS
   WHITE-LIGHT
   PHOTOLUMINESCENCE
   SUBSTITUTION
   DISCOVERY
   TRANSITIONLEDS
   EVOLUTION
   HOST
   LEDS
Аннотация: The design scheme of the chemical unit cosubstitution of [Lu3+-N3-] for [Sr2+-O2-] in Sr2SiO4:Eu2+ has been put into practice to discover the new phosphor systems with tunable luminescence properties, and the structures and photoluminescence tuning of yellow-emitting LuxSr2-xSiNxO4-x:Eu2+ phosphors have been investigated. Crystal structures of LuxSr2-x-ySiNxO4-x:yEu2+ samples were resolved using the Rietveld method, suggesting that the as-prepared Sr2SiO4 belonged to monoclinic symmetry (P21/n) of β-phase Sr2SiO4, while Sr1.97Eu0.03SiO4 and Sr1.965Eu0.03Lu0.005SiO3.995N0.005 belonged to orthorhombic symmetry (Pnma) of α-Sr2SiO4. The emission peaks of LuxSr1.97-xSiNxO4-x:0.03Eu2+ phosphors were red-shifted from 563 to 583 nm upon increasing the [Lu3+-N3-] substitution content from x = 0 to x = 0.005, furthermore, the PL emission peaks of Lu0.005Sr1.965-ySiN0.005O3.995:yEu2+ also showed a red-shift from 583 nm to 595 nm with increasing Eu2+ concentration (y = 0.03, 0.07, 0.10 and 0.15), and their corresponding red-shift mechanism has been discussed. The temperature dependent luminescence results further verified that the introduction of [Lu3+-N3-] for [Sr2+-O2-] in Sr2SiO4:Eu2+ can improve the thermal stability of the photoluminescence, which indicated that the LuxSr2-x-ySiNxO4-x:yEu2+ phosphors have potential applications in white light-emitting diodes (wLEDs). © 2016 The Royal Society of Chemistry.

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Держатели документа:
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
School of Materials Sciences and Technology, China University of Geosciences, 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:
Xia, Z.; Miao, S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, M.; Liu, Q.
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18.

    New garnet structure phosphors, Lu3-xYxMgAl3SiO12:Ce3+ (x = 0-3), developed by solid solution design / H. Ji [et al.] // J. Mater. Chem. C. - 2016. - Vol. 4, Is. 12. - P. 2359-2366, DOI 10.1039/c6tc00089d. - Cited References: 33. - This work was partly supported by the National Natural Science Foundation of China (Grant No. 51511130035, 51272259, 61575182, 51572232 and 51561135015) and the Russian Foundation for Basic Research (Grant No. 15-52-53080). H. J. thanks the China Scholarship Council (CSC) for providing a scholarship to support his study in NIMS. . - ISSN 2050-7534
   Перевод заглавия: Новые люминофоры со структурой граната, Lu3-xYxMgAl3SiO12:Ce3+ (x = 0-3), полученные как твердые растворы

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
Particle-diagnosis approach
   Luminescence
   Photoluminescence
   Ce3+
   Substitution
   Discovery
   Oxygen
Аннотация: New garnet phosphors, Lu3−xYxMgAl3SiO12:Ce3+ (x = 0–3), which can be efficiently excited by blue light and emit the yellow-orange light, were developed using the solid solution design strategy combining the chemical unit substitution and the cation substitution. Crystal structures of the four compounds were reported for the first time via the Rietveld refinement of their powder XRD patterns. All phosphors show the general cubic garnet structure with the space group Iad. The specific occupancy of Lu/Y, Al/Mg, Al/Si and O atoms in different positions was identified. The evolution of cell parameters and Y/Lu/Ce–O bond lengths were identified. Photoluminescence properties were evaluated on aspects of emission/excitation spectra, internal/external quantum efficiency and thermal emission stability. Under the 450 nm blue light excitation, the phosphors exhibit bright yellow color emission, peaking in the 575–597 nm spectral range. The internal and external quantum efficiency can reach 83% and 58%, respectively. The emission red-shift in response to the Y/Lu ratio variation was discussed in relation to the local structure evolution. The phosphors are relatively promising to act as wavelength converter of blue light in white light emitting diodes.

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Держатели документа:
National Laboratory of Mineral Materials, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, China
Sialon Group, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 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 Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China

Доп.точки доступа:
Ji, H.; Wang, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Hirosaki, N.; Huang, Z.; Xia, Z.; Ten Kate, O. M.; Liu, L.; Xie, R.
}
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19.

    Influence of cation substitution on the crystal structure and luminescent properties in apatite structural Ba4.97- xSrx(PO4)3Cl:0.03Eu2+ phosphors / L. Zhu [et al.] // Chem. Phys. Lett. - 2016. - Vol. 658. - P. 248-253, DOI 10.1016/j.cplett.2016.06.061. - Cited References: 23. - This present work was supported by the National Natural Science Foundations of China (Grant Nos. 51472222 and 51372232), the Fundamental Research Funds for the Central Universities (Grant No. 2652015310), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130022110006). . - ISSN 0009-2614
   Перевод заглавия: Влияние катионного замещения на кристаллическую структуру и люминесценные свойства в апатите Ba4.97-xSrx(PO4)3Cl:0.03Eu2+

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
PHOTOLUMINESCENCE
   ENERGY
   Ce3+
   Sr
   UV
Кл.слова (ненормированные):
Substitution -- Apatite -- Ba4.97- xSrx(PO4)3Cl:0.03Eu2+ -- Luminescence
Аннотация: A series of apatite-type phosphors Ba4.97- xSrx(PO4)3Cl:Eu2+(x = 0, 0.5, 1.0, 1.5, 2.0) were synthesized by the high temperature solid-state reaction method, and its luminescence properties were investigated in detail. It can be found that a red shift of the emission peak wavelength emerged from 439 to 462 nm with the continuous introduction of Sr2+ into the crystal lattice which has been simulated by a crystal-field model. The red shift is explained by the distortion in the crystal structure through X-ray diffraction and the Rietveld refinement analysis. According to a recently raised structural model, Eu2+ ions are surrounded by O atoms, PO4 tetrahedrons and Ba/Sr ions. After introducing Sr2+ into the lattice, the interatomic distance between Ba/Sr atoms and Eu2+ was expected to become shorter, resulting in a distortion of the inner EuOn polyhedrons. Then the crystal field strength surrounding Eu2+ was increased, finally resulting in the red shift. © 2016 Published by Elsevier B.V.

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School of Materials Science and Technology, National Laboratory of Mineral Materials, China University of Geosciences, 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:
Zhu, L.; Huang, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Min, X.; Liu, Y.; Fang, M.; Wu, X.
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20.

Zamkova, N. G.
Effect of Sr2+ Ion Substitution with Trivalent Ions (Sc3+, In3+, La3+, Bi3+) on Its Ferroelectric Instability in SrTiO3 / N. G. Zamkova, V. S. Zhandun, V. I. Zinenko // Phys. Solid State. - 2011. - Vol. 53, Is. 11. - P. 2290-2299, DOI 10.1134/S1063783411110345. - Cited References: 14. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00067), the Federal Program of Support for Leading Scientific Schools (project no. NSh-4645.2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
BEHAVIOR
RELAXOR
Аннотация: The vibration frequencies of unstable ferroelectric and antiferrodistortion modes and the dependences of the energy on the ion displacement amplitude have been calculated within the generalized Gordon-Kim model for distortions along eigenvectors of these modes in the mixed compounds Sr(1-x)A(x)Ti(1-x/4)square O-x/4(3) and Sr(1-y)A(2y/3)square y/3TiO3 (A = Sc3+, In3+, La3+, Bi3+; square is the vacancy). To compensate an excess positive charge, vacancies are introduced into the Ti4+ or Sr2+ site. Calculations have been performed in the "average" crystal approximation for impurity concentrations of 0.25 and 0.50. To this end, a set of 40 atomic superlattices with various orderings of heterovalent ions Sr2+ and impurity A(3+) has been considered. It has been found that each impurity type, independently of charge balance, induces ferroelectric instabilities in doped compounds. In the case of doping with In3+ and La3+ for concentration x = 0.25, the possibility of rotating the polarization vector has been shown.

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Держатели документа:
[Zamkova, N. G.
Zhandun, V. S.
Zinenko, V. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Zinenko, V. I.; Зиненко, Виктор Иванович; Замкова, Наталья Геннадьевна
}
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