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Magnetic nanoparticles in borate glasses: Identification and sizing / I. S. Edelman [et al.] // International Conference on Optimization of Electrical and Electronic Equipment (OPTIM 2014) : IEEE Computer Society, 2014. - P. 95-104, DOI 10.1109/OPTIM.2014.6850939. - Cited References: 60 . - ISBN 978-1-4799-5183-3
Рубрики:
Engineering, Electrical and Electronic
Кл.слова (ненормированные):
SUPERPARAMAGNETIC RESONANCE -- FERROMAGNETIC-RESONANCE -- FERRITE NANOPARTICLES -- OXIDE NANOPARTICLES -- FARADAY-ROTATION -- CERAMICS -- IRON -- CRYSTALLIZATION -- ANISOTROPY -- PARTICLES
Аннотация: Heat treatment of borate glasses co-doped with low contents of iron and larger radius elements: Dy, Tb, Gd, Ho, Er, Y and Bi results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: XRD, EXAFS, XANES and SAXS, show a broad distribution of nanoparticle sizes with characteristic depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite and iron garnet allow to unambiguously assigning the nanoparticle structure to maghemite. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. Variable-temperature electron magnetic resonance (EMR) studies confirm the formation of magnetic nanoparticles and the identification of their nature. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by 'direct' techniques. © 2014 IEEE.

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Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Zubavichus, Y.; Trofimova, N. N.; Zaikovskiy, V. I.; Artemenko, A.; Curely, J.; Kliava, J.; Russian Foundation for Basic Research; Russian Foundation for Basic Research; International Conference on Optimization of Electrical and Electronic Equipmen (22 May - 24 May 2014 ; Bran, Romania)
}
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Phase transitions in elpasolites (ordered perovskites) / I. N. Flerov [et al.] // Materials Science and Engineering R: Reports. - 1998. - Vol. 24, Is. 3. - P. 81-151. - Cited References: 174 . - ISSN 0927-796X

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ELASTIC NEUTRON-DIFFRACTION
   MII = CO
   RAMAN-SCATTERING
   THERMODYNAMIC PROPERTIES
   CRYSTAL-STRUCTURE
   SINGLE-CRYSTALS
   RB2KMIIIF6 ELPASOLITES
   CUBIC PEROVSKITES
   TEMPERATURE FORM
   HIGH-RESOLUTION
Кл.слова (ненормированные):
Crystal atomic structure -- Crystal growth -- Crystal lattices -- Crystallization -- Crystallography -- Ferroelectricity -- Hydrostatic pressure -- Order disorder transitions -- Single crystals -- Thermodynamics -- Elpasolites -- Landau theory -- Perovskite
Аннотация: Many compounds with general chemical formula A2BB?X6 and with tolerance factor value t < 1 crystallize in the elpasolite (ordered perovskite) structure. Different preparative methods have been considered. For example, the Bridgman technique is the most suitable method of growing single crystals of halogenated elpasolites with monoatomic cations. Group-theory and symmetry analyses have allowed us to build a scheme of possible structural distortions connected with octahedral rotations and displacements of ions. Experimental observations have proven that ferroelastic phase transitions occurring most frequently in elpasolites are due to small octahedra tilts. Quantitative analysis allows the possibility of describing these transitions in the framework of the thermodynamic Landau theory. Hydrostatic pressure and the substitution of atoms in different crystallographic sites allow to change significantly the succession and the temperature of phase transitions. The hypothesis of bond stresses is able to predict the possible occurrence of a phase transition for a particular elpasolite and/or the role of the octahedra rotations in the transformation. The mechanism of phase transitions in elpasolites and related compounds has also been considered. One can assume that a displacive mechanism associated with a strong anharmonicity plays a large role in phase transitions occurring in compounds with monoatomic cations. On the other hand, for instance, in cryolites with ammonium cations, the transitions originate from an order-disorder phenomenon. В© 1998 Elsevier Science S.A. All rights reserved.

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Держатели документа:
L.V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Inst. Chim. Matiere Cond. B., Universite Bordeaux I, 33608, Pessac Cedex, France
Lab. de Phys.-Chim. Molec., Universite Bordeaux I, 33405, Talence Cedex, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Tressaud, A.; Grannec, J.; Couzi, M.
}
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Kveglis, L. I.
The self-organization of tetrahedrally close-packed structures in magnetic nanocrystalline Tb-Fe and Co-Pd films / L. I. Kveglis, A. V. Kuzovnikov, I. V. Timofeev ; ed.: BM Darinskii, , BM Darinsk // Mechanical spectroscopy III: Mechanical spectroscopy and relaxation phenomena IN SOLIDS. Ser. Solid state phenomena : Trans tech publications LTD, 2006. - Vol. 115. - P. 267-273. - Cited References: 19 . - ISBN 1012-0394. - ISBN 3-908451-24-8

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter + Spectroscopy
Рубрики:
AMORPHOUS FILMS
Кл.слова (ненормированные):
dissipative structures -- explosive crystallization -- thermal conductivity -- Tb-Fe films -- Co-Pd films
Аннотация: The self-organization of an atomic structure in Tb30Fe70 and Co50Pd50 films possessing of high values of the perpendicular magnetic anisotropy (PMA) constant (K perpendicular to similar to 10(6) erg/cm(3)) is investigated by transmission electron microscopy. The crystallization of the films is realized in an explosive way with formation of different dissipative structures from the initial nanocrystalline state. In present work the structural model of a thin film in mezzo-scale and the correlation of a structure with magnetic properties are discussed.

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Доп.точки доступа:
Kuzovnikov, A. V.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Darinskii, B. M. \ed.\; International Conference on Mechanical Spectroscopy and Relaxation Phenomena in Solids (3 ; 2006 ; Cracow, Poland)
}
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Synthesis and magnetic properties of β-Cu3Fe4(VO4)6 single crystals / D. A. Balaev [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2015. - Vol. 233-234: Achievements in Magnetism. - P. 137-140, DOI 10.4028/www.scientific.net/SSP.233-234.137 . - ISSN 1662-9779. - ISSN 978-3-038
Рубрики:
Achievements in magnetism
Кл.слова (ненормированные):
lyonsite -- spontaneous crystallization -- spin glass -- single crystal -- magnetization
Аннотация: β-Cu3Fe4(VO4)6 single crystals were synthesized. The X-ray, magnetic, Mössbauer, and EPR investigations of the crystals were fulfilled. It is established that single-crystal β-Cu3Fe4(VO4)6 is a spin glass at low temperatures. Freezing temperature varies considerably depending on the orientation of the magnetic field relative to the crystal axes. Spin-glass state is confirmed by the relaxation of the magnetization.

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Доп.точки доступа:
Perov, N. \ed.\; Semisalova, A. \ed.\; Balaev, D. A.; Балаев, Дмитрий Александрович; Bayukov, O. A.; Баюков, Олег Артемьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pankrats, A. I.; Панкрац, Анатолий Иванович; Sablina, K. A.; Саблина, Клара Александровна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
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    Low-temperature structural and magnetic phase transitions in multiferroic GdFe3(BO3)4 / K. V. Frolov [et al.] // J. Alloys Compd. - 2016. - Vol. 671. - P. 545-551, DOI 10.1016/j.jallcom.2016.02.083. - Cited References:36. - We thank Dr. A.P. Dudka for help in the low temperature XRD measurements. This study was supported in part by the Russian Foundation for Basic Research (projects # 14-02-00483a and 13-02-12442), and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (grant # NSh-1130.2014.5 and # NSh-924.2014.2). This work was performed using the equipment of the Shared Research Center IC RAS and was supported by the Russian Ministry of Education and Science (project RFMEFI62114X0005). . - ISSN 0925-8388. - ISSN 1873-4669
   Перевод заглавия: Низкотемпературные структурные и магнитные фазовые переходы в мультиферроике GdFe3(BO3)4

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
IRON BORATE GDFE3(BO3)4
   BIFEO3 THIN-FILMS
   MAGNETOELASTIC PROPERTIES
   RM3(BO3)4 CRYSTALS
   TRIGONAL GDFE3(BO3)4
   ENHANCED POLARIZATION
   HIGH-PRESSURES
   CRYSTALLIZATION
   BEHAVIOR
   GROWTH
Кл.слова (ненормированные):
Multiferroics -- Rare earth compounds -- X-ray diffraction -- Mossbauer -- spectroscopy -- Crystal structure -- Spin dynamics
Аннотация: X-ray analysis revealed that at temperature decreasing from room temperature to Tstr = 155 K the crystal unit cell GdFe3(BO3)4 is reduced only along the c axis (at 0.01 Å), while the a and b axes are unchanged within the error limits. The volume of the crystal decreases uniformly in the direction of all three axes at 155–80 K. At 80–30 K the crystal volume is decreased only by reduction of the parameters a and b, while the parameter c increases conversely. In the paramagnetic region Mössbauer spectra do not distinguish between the two structural positions of iron ions Fe1 and Fe2, appearing at T < Tstr. Below the temperature of the magnetic phase transition at TN = 38.0(1) K the Mössbauer data indicate quasi-one-dimensional magnetic ordering of iron moments in the sublattice Fe2 and a two-dimensional one in the iron sublattice Fe1. The dynamics of spin reorientation in sublattices Fe1 and Fe2 is studied in detail.
Рентгеновский анализ показал, что при уменьшении температуры от комнатной до Tstr = 155 K изменение параметра элементарной ячейки кристалла GdFe3(BO3)4 происходит лишь вдоль оси с (при 0,01 Å), в то время как а и b оси остаются неизменными в пределах погрешности измерений. Объем кристалла уменьшается равномерно в направлении всех трех осей при 155-80 K. При 80-30 K объем кристалла уменьшается только уменьшением параметров a и b, в то время как параметр с наоборот увеличивается. В парамагнитной области Мессбауэровские спектры не различают двух структурных позиций ионов железа Fe1 и Fe2, появляющиеся при Т˂Tstr. Ниже температуры магнитного фазового перехода при TN = 38,0(1) К Мёссбауэрские данные указывают на квази-одномерный магнитное упорядочение моментов железа в подрешетке Fe2 и двумерное в железной подрешетке Fe1. Динамика спиновой переориентации в подрешетках Fe1 и Fe2 подробно изучается.

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Держатели документа:
Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 119333, Russia.
Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA.
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Frolov, K. V.; Lyubutin, I. S.; Smirnova, E. S.; Alekseeva, O. A.; Verin, I. A.; Artemov, V. V.; Kharlamova, S. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [14-02-00483a, 13-02-12442]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-1130.2014.5, NSh-924.2014.2]; Russian Ministry of Education and Science [RFMEFI62114X0005]
}
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    Layered hydroxyl sulfate: Controlled crystallization, structure analysis, and green derivation of multi-color luminescent (La,RE)2O2SO4 and (La,RE)2O2S phosphors (RE = Pr, Sm, Eu, Tb, and Dy) / X. Wang [et al.] // Chem. Eng. J. - 2016. - Vol. 302. - P. 577-586, DOI 10.1016/j.cej.2016.05.089. - Cited References: 50. - This work is supported in part by the National Natural Science Foundation of China (Grants Nos. 51172038, 51302032, and U1302272), the Fundamental Research Fund for the Central Universities (Grant No. N140204002), Grants-in-Aid for Scientific Research (KAKENHI No. 26420686), and the Russian Foundation for Basic Research (15-52-53080). X.J. Wang acknowledges financial support from the China Scholarship Council for her overseas Ph.D. study (Contract No. 201406080035) and the assistance of Q. Q. Zhu (University of Science and Technology of China) for his help with calcination. . - ISSN 1385-8947
   Перевод заглавия: Слоистые гидроксил сульфаты: контролируемая кристаллизация, структурный анализ, и зеленый синтез мультицветных люминофоров (La,RE)2O2SO4 и (La,RE)2O2S (RE=Pr, Sm, Eu, Tb, and Dy)

РУБ Engineering, Environmental + Engineering, Chemical
Рубрики:
PHOTOLUMINESCENCE PROPERTIES
   OXYSULFATE/OXYSULFIDE SYSTEMS
   CRYSTAL-STRUCTURE
   OXYGEN-STORAGE
   Ln
   NANOCOMPOSITES
   EMISSION
   CAPACITY
   FAMILY
   FABRICATION
Кл.слова (ненормированные):
Sulfate type layered rare earth hydroxide -- Luminescence -- Oxysulfate -- Oxysulfide
Аннотация: The two important groups of Ln2O2SO4 and Ln2O2S compounds are traditionally synthesized with the involvements of environmentally harmful sulfur-containing reagents. We developed in this work a unique green approach for their synthesis, using Ln2(OH)4SO4·2H2O layered hydroxyl sulfate as the precursor (Ln-241 phase). Phase selective crystallization of La-241 under both atmospheric pressure and hydrothermal conditions was firstly optimized, followed by transformation into La2O2S and La2O2SO4 by controlled calcination. Rietveld structure refinement was performed for La-241, La(OH)SO4, La2O2SO4, and La2O2S, and the crystal structure and cell parameters of La-241 were originally reported. The photoluminescence performances of several important activators (Pr3+, Sm3+, Eu3+, Tb3+, and Dy3+) in the two hosts, in terms of excitation, emission, quantum yield, and color coordinates of emission, were thoroughly investigated, and multi-color luminescence including bright red, green, orange red, and yellow was obtained under ultraviolet excitation. Detailed investigations of Tb3+ photoluminescence revealed that the lack of 5D3 emission in La2O2S and the gradual quenching of 5D3 blue emission at a higher Tb3+ content (hence decreasing I488/I545 ratio and changing color coordinates) in La2O2SO4 were suggested to be due to thermal activation of the 5D3 electrons into the conduction band and cross relaxation between adjacent Tb3+, respectively. The synthesis approach developed in this work for La2O2SO4 and La2O2S, with water vapor as the only exhaust gas, is environmentally benign and holds great potential in the facile synthesis of analogous compounds of other lanthanides. © 2016 Elsevier B.V.

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Держатели документа:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, China
Advanced Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
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:
Wang, X.; Li, J. -G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhu, Q.; Li, X.; Sun, X.
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Dielectric properties of a mixed-valence Pb3Mn7O15 manganese oxide / N. V. Volkov [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 37. - Ст. 375901, DOI 10.1088/0953-8984/22/37/375901. - Cited References: 14. - This study was supported by the Russian Foundation for Basic Research 'Siberia', project No. 09-02-98003, and the Siberian Branch of the Russian Academy of Sciences, integration project No. 101. . - ISSN 0953-8984

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
cation -- lead -- manganese derivative -- oxide -- article -- chemical model -- chemistry -- crystallization -- electric conductivity -- electronics -- methodology -- temperature -- Cations -- Crystallization -- Electric Conductivity -- Electronics -- Lead -- Manganese Compounds -- Models, Chemical -- Oxides -- Temperature -- AC electric field -- Analysis of resistivity -- Carrier hopping -- Charge ordering -- Complex dielectric constant -- Crystal site -- Debye models -- Dielectric constants -- Dielectric spectra -- Frequency windows -- Lattice sites -- Low frequency -- Manganese ions -- Mixed valence -- Mixed valence state -- Relaxation behaviors -- Temperature range -- Electric fields -- Manganese -- Manganese oxide -- Permittivity -- Single crystals -- Crystal symmetry
Аннотация: We investigated the low-frequency dielectric properties of a Pb3Mn7O15 single crystal with manganese ions in the mixed-valence state (Mn3+/Mn4+). Dielectric relaxation was found in the frequency window from 20 to 100 kHz in the temperature range 110-180 K. The dielectric spectra of the crystal were analyzed using a Debye model. Estimations made within the model and analysis of resistivity data suggest that the relaxation behavior of the dielectric constant is related to polaronic charge carrier hopping. Around 250 K, charge ordering occurs in the crystal when the Mn3+ and Mn4+ ions are arranged in a specific order among the crystal sites. With a decrease in temperature, an ac electric field can induce a charge hop between the equivalent lattice sites available, related to crystal symmetry. This hopping is equivalent to the reorientation of an electric dipole that yields Debye-type behavior of the complex dielectric constant. The observed anisotropy in the behavior of the dielectric properties and resistivity can be attributed to a pronounced two-dimensional character of the crystal structure.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Sablina, K. A.
Sapronova, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russia.
L V Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Sablina, K. A.; Саблина, Клара Александровна; Sapronova, N. V.
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The magnetoelastic effect in CoxMn1-xS solid solutions / S. S. Aplesnin [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 13-14. - P. 564-567, DOI 10.1016/j.ssc.2010.01.009. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a. . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
YVO3 SINGLE-CRYSTAL
   SPIN-STATE
   TRANSITION
   TRANSPORT
   PHYSICS
   LACOO3
Кл.слова (ненормированные):
Semiconductors -- X-ray scattering -- Galvanomagnetic effects -- Thermal expansion -- Semiconductors -- X-ray scattering -- Galvanomagnetic effects -- Thermal expansion -- Semiconductors -- X-ray scattering -- Coefficient of thermal expansion -- Magnetoelastic effects -- Orbital ordering -- Temperature hysteresis -- Temperature range -- Zero magnetic fields -- Crystallization -- Electric resistance -- Magnetic field effects -- Magnetoresistance -- Manganese -- Manganese compounds -- Neon -- Organic polymers -- Scattering -- Semiconductor quantum dots -- Solid solutions -- Solidification -- Thermal stress -- X ray scattering -- Thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H < 0.1 T and at T < 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Aplesnin, S. S.
Ryabinkina, L. I.
Romanova, O. B.
Har'kov, A. M.] MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
[Gorev, M. V.
Balaev, A. D.
Eremin, E. V.
Bovina, A. F.] Russian Acad Sci, KSC Siberian Branch, Ctr Shared, Krasnoyarsk 660036, Russia
КНЦ СО РАН
M.F. Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation
Center of shared using KSC Siberian branch, Russian Academy Science, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Romanova, O. B.; Романова, Оксана Борисовна; Har'kov, A. M.; Gorev, M. V.; Горев, Михаил Васильевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Eremin, E. V.; Еремин, Евгений Владимирович; Bovina, A. F.; Бовина, Ася Федоровна
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Magnetic properties and the metal-insulator transition in GdXMn1-XS solid solutions / O. B. Romanova [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 13-14. - P. 602-604, DOI 10.1016/j.ssc.2009.12.042. - Cited References: 13. - This study was supported by the Russian Foundation for Basic Research project No. 09-02-00554_a; No. 09-02-92001-NNS_a; No. 08-02-90031 Bel_a and Belarus Foundation for Basic Research project No. F04-182; ADTF "Development of scientific potential of the higher school" No. 2.1.1/401. . - ISSN 0038-1098

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
Insulator -- Metals -- Crystal growth -- Phase transitions -- Insulator -- Metals -- Crystal growth -- Phase transitions -- Insulator -- Metals -- Antiferromagnetic semiconductors -- Crystal growth -- Cubic lattice -- Metal-insulator phase transition -- Orders of magnitude -- P-type -- Temperature range -- Thermoelectric properties -- Thermopowers -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal growth -- Crystallization -- Electric properties -- Gadolinium -- Grain boundaries -- Magnetic fields -- Magnetic properties -- Manganese -- Manganese compounds -- Metal insulator boundaries -- Metals -- Semiconductor growth -- Semiconductor insulator boundaries -- Sodium chloride -- Solid solutions -- Solidification -- Metal insulator transition
Аннотация: The structural, magnetic, electrical, and thermoelectric properties of GdXMn1-XS (0.01 <= X <= 0.3) solid solutions synthesized for the first time on the basis of alpha-MnS have been studied experimentally in the temperature range 77-1000 K in magnetic fields up to 10 kOe. The synthesized samples are antiferromagnetic semiconductors with an NaCl-type cubic lattice typical of a-MnS. Both concentration (X-c = 0.3) and temperature (T-c = 450 K) metal-insulator phase transitions have been observed. The concentration metal-insulator transition is accompanied by a decrease in resistivity and thermopower by twelve and two orders of magnitude, respectively, with the change in conductivity from p-type to n-type. (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Romanova, O. B.
Ryabinkina, L. I.
Velikanov, D. A.
Balaev, D. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Sokolov, V. V.
Pichugin, A. Yu.] Russian Acad Sci, Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia
[Galyas, A. I.
Demidenko, O. F.
Makovetskii, G. I.
Yanushkevich, K. I.] Natl Acad Sci Belarus, GO NPTs Mat Sci Ctr, Minsk 220072, Byelarus
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Institute of Inorganic Chemistry, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russian Federation
GO NPTs Materials Science Center, National Academy of Sciences of Belarus, 220072 Minsk, Belarus

Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Sokolov, V. V.; Pichugin, A. Y.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Galyas, A. I.; Demidenko, O. F.; Makovetskii, G. I.; Yanushkevich, K. I.
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10.

Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic NdFe3(BO3)(4) / M. N. Popova [et al.] // Phys. Rev. B. - 2007. - Vol. 75, Is. 22. - Ст. 224435, DOI 10.1103/PhysRevB.75.224435. - Cited References: 22 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)(4)
   CRYSTALLIZATION
   SPECTROSCOPY
   LASER
   ND3+
Аннотация: We report high-resolution optical absorption spectra for NdFe3(BO3)(4) trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering T-N=33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g factors. In particular, the values g(perpendicular to)=2.385 and g(parallel to)=1.376 were found for the Nd3+ ground-state doublet. We obtain B-loc=7.88 T and parallel to J(FN)parallel to=0.48 K for the values of the local effective magnetic field at liquid-helium temperatures at the Nd3+ site and the Nd-Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm(-1). To check the reliability of our set of crystal-field parameters, we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions J(nn)=-6.25 K (intrachain interactions) and J(nnn)=-1.92 K (interchain interactions) obtained from fitting agree well with the experimental data.

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Держатели документа:
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
Kazan VI Lenin State Univ, Kazan 420008, Russia
Ecole Natl Super Chim Paris, CNRS, UMR7574, Lab Chim Appl & Etat Solide, F-75231 Paris, France
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Russian Federation
Kazan State University, 420008 Kazan, Russian Federation
Laboratoire de Chimie Applique'e de l'E Tat Solide, CNRS-UMR7574, ENSCP, 11, Rue Pierre et Marie Curie, F-75231 Paris Cedex 05, France
Physics Faculty, Moscow State University, 119992 Moscow, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Stanislavchuk, T. N.; Malkin, B. Z.; Zakirov, A. R.; Antic-Fidancev, E.; Popova, E. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович
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