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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O., Gorev M. V., Velikanov D. A., Gamzatov A. G., Aliev A. M.
Заглавие : Magnetic and thermophysical properties of GdxMn1-xS solid solutions
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, Is. 2. - Ст.025802. - P. - ISSN 0953-8984, DOI 10.1088/0953-8984/25/2/025802
Ключевые слова (''Своб.индексиров.''): antiferromagnetic orders--band state--face-centered cubic lattices--magnetic phase transitions--paramagnetic phase--temperature dependence--antiferromagnetism--electron transitions--gadolinium--manganese--paramagnetism--sodium chloride--specific heat--organic polymers
Аннотация: The structural, magnetic, and thermophysical properties of cation-substituted sulfides GdXMn1-XS (0.04 ? X ? 0.25) with the NaCl-type face-centered cubic lattice have been investigated. The range of existence of long-range antiferromagnetic order has been established. The anomalies observed in the temperature dependence of the specific heat correspond to the temperatures of the magnetic phase transition. The anomaly in the specific heat caused by electron transitions between the 4f levels and d band states has been observed. It has been found that the coefficient of thermal expansion decreases with increasing concentration of substituents in the magnetically ordered region and remains nearly invariable in the paramagnetic phase. В© 2013 IOP Publishing Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Y. V., Oreshonkov A. S., Ivanenko A. A., Molokeev M. S., Isaenko L. I., Flerov I. N., Bogdanov E. V., Gorev M. V., Kartashev A. V., Krylov A. S.
Заглавие : Structural, spectroscopic, and thermophysical investigations of the oxyfluorides CsZnMoO3F3 and CsMnMoO3F3 with the pyrochlore structure
Коллективы : Russian Foundation for Basic Research [12-02-31205_mol_a]; Ministry of Education and Science of the Russian Federation [8379]; Siberian Branch of the Russian Academy of Sciences [28]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 3. - P.599-605. - ISSN 1063-7834, DOI 10.1134/S1063783414030135. - ISSN 1090-6460
Примечания : Cited References: 26. - This study was supported by the Russian Foundation for Basic Research (project no. 12-02-31205_mol_a), the Ministry of Education and Science of the Russian Federation within the framework of the Federal Target Program "Scientific and Scientific-Pedagogical Human Resources for the Innovative Russia" (agreement no. 8379), and the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration Project no. 28).
Предметные рубрики: PHASE-TRANSITIONS
CRYSTAL-STRUCTURE
STATE
Cs
Mo
Аннотация: The structure, infrared and Raman spectra, heat capacity, and thermal expansion have been investigated. It has been shown that, down to liquid-helium temperatures, the cubic pyrochlore structure of the CsMnMoO3F3 and CsZnMoO3F3 oxyfluorides remains stable. The influence of cation substitution on individual features of the properties of the oxyfluorides has been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Petrakovskii G. A., Tugarinov V. I., Kartashev A. V., Temerov V. L.
Заглавие : Magnetic-resonance and thermophysical studies of the magnetic phase diagram for a GdFe2.1Ga0.9(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Magnetic-resonance and thermophysical studies of the magnetic phase diagram for a GdFe2.1Ga0.9(BO3)4 single crystal
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 3. - P483-489. - ISSN 1063-7761, DOI 10.1134/S1063776111070089
Примечания : Cited References: 21. - This work was supported by the Russian Foundation for Basic Research (project no. 10-02-00765a).
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
ND3+
Ключевые слова (''Своб.индексиров.''): anisotropy field--antiferromagnetic resonance--critical fields--entire domain--field dependence--iron ions--magnetic phase diagrams--resonance measurement--thermophysical--antiferromagnetism--magnetic fields--magnetic properties--magnetic resonance--metal ions--phase diagrams--single crystals--antiferromagnetic materials
Аннотация: The antiferromagnetic resonance, heat capacity, magnetic properties, and magnetic phase diagram of a GdFe3(BO3)(4) crystal in which some of the iron ions were substituted by diamagnetic gallium ions have been investigated. It has been found that the Ne,l temperature upon diamagnetic substitution decreased to 17 K compared to 38 K in the unsubstituted crystal. The effective exchange and anisotropy fields for GdFe2.1Ga0.9(BO3)(4) have been estimated from the field dependences of magnetization and resonance measurements. The magnetic phase diagram of the crystal has been constructed from magnetic and resonance measurements. In GdFe2.1Ga0.9(BO3)(4), there is no spontaneous reorientation and, in the absence of a magnetic field, the crystal remains an easy-axis one in the entire domain of magnetic ordering. The critical field of the reorientation transition to an induced easy-plane state in a magnetic field along the trigonal axis has been found to increase compared to that in the unsubstituted crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Flerov I. N., Gorev M. V., Bogdanov E. V., Bovina A. F., Laptash N. M.
Заглавие : Thermophysical studies of the phase transitions in (NH4)(3)NbOF6 crystals
Разночтения заглавия :авие SCOPUS: Thermophysical studies of the phase transitions in (NH4) 3NbOF6 crystals
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 8. - P1548-1553. - ISSN 1063-7834, DOI 10.1134/S1063783407080240
Примечания : This work was supported by the Russian Foundation for Basic Research (project no. 06-02-16102), Krasnoyarsk Regional Science Foundation (project no.16G098), and the Council on Grants from President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (project NSh-4137.2006.2). - Cited References: 17
Предметные рубрики: OXYFLUORIDES
DISORDER
RB
CS
Аннотация: The thermophysical properties of oxyfluoride (NH4)(3)NbOF6 were studied in detail over wide ranges of temperatures and pressures. At atmospheric pressure, a sequence of four structural phase transitions was established with the following changes in entropy: Delta S (1) = Rln 2.7, delta S (2) = Rln38.3, Delta S (3) = 0.08R, and Delta S (4) = 0.17R. An external hydrostatic pressure was found to narrow the region of existence of the initial cubic phase. A triple point was detected in the p-T diagram; at a pressure above 0.07 GPa, the transition between the tetragonal and monoclinic phases occurs through a distorted high-pressure phase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GOREV M. V., FLEROV I. N., VORONOV V. N., TRESSO A., GRANNEK J., GHAMINADE J. P.
Заглавие : THERMOPHYSICAL STUDIES OF THE RB2KFEF6 FERROELASTIC
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 36, Is. 4. - P1121-1125. - ISSN 0367-3294
Примечания : Cited References: 15
Предметные рубрики: STRUCTURAL PHASE-TRANSITIONS
RB2KMIIIF6 ELPASOLITES
DIAGRAMS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Raevskaya S. I., Flerov I. N., Malitskaya M. A., Raevskii I. P.
Заглавие : Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 9. - P.1046-1050. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816090148
Примечания : Cited References: 18. - This work was supported by Southern Federal University, project no. 213.01-2014/012-VG.
Ключевые слова (''Своб.индексиров.''): niobium oxide--sodium--specific heat--temperature distribution--thermal expansion--ceramic samples--effect of heat treatments--possible mechanisms--sodium lithium niobate--structural distortions--structural phase transition--temperature dependence--temperature range--lithium
Аннотация: Temperature dependences of specific heat Cp(T) and coefficient of thermal expansion α(T) for Na0.95Li0.05NbO3 sodium-lithium niobate ceramic samples are investigated in the temperature range of 100–800 K. The Cp(T) and α(T) anomalies at T3 = 310 ± 3 K, T2 = 630 ± 8 K, and T1 = 710 ± 10 K are observed, which correspond to the sequence of phase transitions N ↔ Q ↔ S(R) ↔ T2(S). The effect of heat treatment of the samples on the sequence of structural distortions was established. It is demonstrated that annealing of the samples at 603 K leads to splitting of the anomaly corresponding to the phase transition Q → R/S in two anomalies. After sample heating to 800 K, the only anomaly is observed in both the Cp(T) and α(T) dependence. Possible mechanisms of the observed phenomena are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korotkov L. N., Stekleneva L. S., Flerov I. N., Mikhaleva E. A., Rysiakiewicz-Pasek E., Molokeev M. S., Bondarev I. A., Gorev M. V., Sysoev O. I.
Заглавие : X-Ray, Dielectric, and Thermophysical Studies of Rubidium Tetrachlorozincate inside Porous Glasses
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 9. - P.1072-1076. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819090132
Примечания : Cited References: 17
Аннотация: Results are presented from studying the X-ray diffraction, heat capacities, dielectric permittivities, and coefficients of the volumetric thermal expansion of composite materials obtained by embedding of Rb2ZnCl4 salt into the porous matrices of borosilicate glass with average pore diameters of 46 and 320 nm in the temperature range of 120–350 K. The temperatures of transitions to the incommensurate and ferroelectric phases are determined, along with the freezing temperature of the mobility of domain boundaries in Rb2ZnCl4 particles. A substantial increase in their Curie temperature is observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova L. T., Molokeev M. S., Irtyugo L. A., Beletskii V. V., Kargin, Yu. F., Denisov V. M.
Заглавие : Synthesis, structure, and thermophysical properties of EuGaGe2O7
Место публикации : Inorg. Mater. - 2020. - Vol. 56, Is. 8. - P.854-858. - ISSN 0020-1685, DOI 10.1134/S002016852008004X. - ISSN 1608-3172(eISSN)
Примечания : Cited References: 18
Предметные рубрики: TEMPERATURE HEAT-CAPACITY
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
Аннотация: The europium gallium germanate EuGaGe2O7 has been prepared by solid-state reaction in air in the temperature range 1273–1473 K using a stoichiometric mixture of Eu2O3, Ga2O3, and GeO2. Its crystal structure has been determined by X-ray diffraction (sp. gr. P21/c, a = 7.1693(7) Å, b = 6.57008(6) Å, c = 12.7699(1) Å, β = 117.4522(5)°, V = 533.768(8) Å3). The heat capacity of polycrystalline samples has been determined by differential scanning calorimetry in the temperature range 350–1053 K and the experimental data have been used to calculate the thermodynamic properties (enthalpy increment, entropy change, and reduced Gibbs energy change) of EuGaGe2O7.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova L. T., Molokeev M. S., Denisov V. M., Golubeva E. O., Galiakhmetova N. A.
Заглавие : Synthesis, Structure, and Thermophysical Properties of Pb10 – xBix(GeO4)2 + xVO4)4 – x (x = 0–3) in the Temperature Range of 350–950 K
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 11. - P.2045-2051. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783420110116
Примечания : Cited References: 26. - The study was carried out under the state assignment for science for the Siberian Federal University, project no. FSRZ-2020-0013
Аннотация: The Pb10 – xBix(GeO4)2 + x(VO4)4 – x (x = 0–3) compounds with an apatite structure have been obtained for the first time from the initial PbO, Bi2O3, GeO2, and V2O5 oxides by the solid-state synthesis in the temperature range of 773–1073 K. The structure of the compounds has been determined by X-ray diffraction analysis. The effect of temperature on specific heat of the synthesized compounds has been investigated by differential scanning calorimetry. The thermodynamic properties of the compounds have been calculated from the experimental Cp = f(T) data.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova L. T., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S., Irtyugo L. A., Beletskii V. V., Denisov V. M.
Заглавие : Synthesis, crystal structure, luminescence, and thermophysical properties of TbGaGe2O7
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.75-78. - ISSN 10637834 (ISSN), DOI 10.1134/S106378342101008X
Примечания : Cited References: 11. - We are grateful to the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences
Аннотация: Germanate TbGaGe2O7 has been obtained from the initial Tb2O3, Ga2O3, and GeO2 oxides by the solid-phase synthesis. The germanate structure has been established by X-ray diffraction. Room-temperature luminescence spectra of the compound have been recorded. The effect of temperature on the heat capacity of the oxide compound has been investigated by differential scanning calorimetry. The thermodynamic properties of the compound have been calculated from the experimental Cp = f(T) data.
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