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Adiabatic calorimetric study of the intense magnetocaloric effect and the heat capacity of (La(0.4)Eu(0.6))(0.7)Pb(0.3)MnO(3) / A. V. Kartashev [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 11. - P. 2115-2120, DOI 10.1134/S1063783408110188. - Cited References: 15. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-1011.2008.2) and the Siberian Branch of the Russian Academy of Sciences ( Lavrent'ev Competition of Young Scientists Projects, grant no. 51) within the framework of the Integration Project no. 3.7 of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LA0.7CA0.3MNO3
MANGANITES
Кл.слова (ненормированные):
75 -- 30 -- Sg -- 75 -- 40 -- Cx
Аннотация: The temperature dependences of the intense magnetocaloric effect T (AD)(T, H) and the heat capacity C (p) (T) of the (La(0.4)Eu(0.6))(0.7)Pb(0.3)MnO(3) manganite are directly measured using adiabatic calorimetry. The experimental dependences T (AD)(T) are in satisfactory agreement with those calculated from the data on the behavior of the magnetization. The factors responsible for the absence of an anomaly in the experimental temperature dependence of the heat capacity C (p) (T) in the range of the magnetic phase transition are discussed.

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Держатели документа:
[Kartashev, A. V.
Flerov, I. N.
Volkov, N. V.
Sablina, K. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Flerov, I. N.
Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660079, Russian Federation

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Volkov, N. V.; Волков, Никита Валентинович; Sablina, K. A.; Саблина, Клара Александровна
}
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Anomalous behaviour of thermodynamic properties at successive phase transitions in (NH4)3GeF7 / E. V. Bogdanov [et al.] // J. Solid State Chem. - 2017. - Vol. 256. - P. 162-167, DOI 10.1016/j.jssc.2017.09.010. - Cited References: 23. - The reported study was partially supported by the Russian Foundation for Basic Research, research project no. 15-02-02009 a. . - ISSN 0022-4596
Кл.слова (ненормированные):
Phase transition -- Fluorides -- Heat capacity -- Entropy -- Thermal expansion -- High pressure
Аннотация: Heat capacity, thermal dilatation, susceptibility to hydrostatic pressure and dielectric properties associated with succession of three phase transitions below room temperature in double fluoride salt (NH4)3GeF7 were studied. A possible transformation into the parent Pm-3m cubic phase was not observed up to the decomposition of compound. Nonferroelectric nature of structural distortions was confirmed. The DTA under pressure studies revealed a high temperature stability of two phases: P4/mbm and Pbam. The entropies of the phase transitions agree well with the model of structural distortions. Analysis of the thermal properties associated with the individual phase transitions in the framework of thermodynamic equations has shown a high reliability of the data obtained. © 2017 Elsevier Inc.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry, Far Eastern Department of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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Barocaloric effect near the structural phase transition in the Rb2KTiOF5 oxyfluoride / M. V. Gorev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 2. - P. 377-383, DOI 10.1134/S1063783410020253. - Cited References: 21. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration Project no. 34), the Russian Foundation for Basic Research and the Krasnoyarsk Regional Scientific Foundation within the framework of the "Sibir'" Project (project no. 09-02-98001), and the Council on Grants from the President of the Russian Federation for Support of the Leading Scientific Schools of the Russian Federation (grant no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HEAT-CAPACITY
PRESSURE
Аннотация: The barocaloric effect (BCE) in the oxyfluoride Rb2KTiOF5 has been studied in the vicinity of the structural phase transition at a temperature of 215 K in the pressure range 0-0.6 GPa. It has been established that the extensive and intensive barocaloric effects are Delta S-BCE similar to -46 J/kg K and Delta T (AD) similar to 18 K, respectively, over a wide temperature range 215-280 K. The studies performed have shown that the external hydrostatic pressure is a very effective tool for changing the entropy and temperature of the crystals which undergo structural phase transitions accompanied by a large change in the entropy.

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Оригинал на русском языке Барокалорический эффект в области структурного фазового перехода в оксифториде Rb2KTiOF5 [Текст] / М. В. Горев [и др.] // Физика твердого тела. - Санкт-Петербург : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 52 № 2. - С. 351-357

Держатели документа:
[Gorev, M. V.
Flerov, I. N.
Bogdanov, E. V.
Voronov, V. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gorev, M. V.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobody 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya, Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Voronov, V. N.; Воронов, Владимир Николаевич; Laptash, N. M.
}
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Calorimetric, dilatometric and DTA under pressure studies of the phase transitions in elpasolite (NH4)2KZrF7 / M. V. Gorev, A. V. Kartashev, E. V. Bogdanov [et al.] // J. Fluor. Chem. - 2020. - Vol. 235. - Ст. 109523, DOI 10.1016/j.jfluchem.2020.109523. - Cited References: 45. - The reported study was funded by RFBR according to the research project No. 18-02-00269 a. X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" . - ISSN 0022-1139
Кл.слова (ненормированные):
Phase transition -- Fluorides -- Heat capacity -- Entropy -- Thermal expansion -- High pressure
Аннотация: Heat capacity, thermal expansion, and sensitivity to the hydrostatic pressure of (NH4)2KZrF7 elpasolite are studied in a wide temperature range. The changes in deformation and entropy during successive phase transitions are determined: Δ(ΔV/V) = 3·10−4; ΔS = 8 J/mol K The temperatures and entropies of phase transitions turned out to be slightly sensitive to pressure changes. An analysis of the entropy of phase transformations was performed in the framework of the model of the cubic phase structure Fm-3 m. In the low temperature phase, an anomalous behavior of thermodynamic properties, which is not characteristic of phase transitions, was observed, accompanied by a significant change in the crystal lattice entropy.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660074, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Institute of Chemistry, Far Eastern Department of RAS, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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Crystal structure and thermodynamic properties of titanate ErGaTi2O7 / L. T. Denisova, M. S. Molokeev, V. V. Ryabov [et al.] // Russ. J. Inorg. Chem. - 2021. - Vol. 66, Is. 4. - P. 532-537, DOI 10.1134/S0036023621040082. - Cited References: 29 . - ISSN 0036-0236
Кл.слова (ненормированные):
erbium gallium titanate -- solid-state synthesis -- crystal structure -- high-temperature heat capacity -- thermodynamic functions
Аннотация: Erbium gallium titanate was prepared by solid-phase synthesis via the sequential calcination of precursor oxides in an air atmosphere at 1273 and 1573 K. The crystal structure of ErGaTi2O7 was characterized by full-profile analysis for the X-ray diffraction pattern of the synthesized powder sample as follows: space group Pcnb, a = 9.77326(15) Å, b = 13.5170(2) Å, c = 7.33189(11) Å, V = 918.58(3) Å3, ρ = 6.10 g/cm3. The high-temperature heat capacity of erbium gallium titanate was measured by differential scanning calorimetry within a temperature range of 320–1000 K. Based on these data, the basic thermodynamic functions of ErGaTi2O7 were calculated.

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Публикация на русском языке Кристаллическая структура и термодинамические свойства титаната ErGaTi2O7 [Текст] / Л. Т. Денисова, М. С. Молокеев, В. В. Рябов [и др.] // Журн. неорг. химии. - 2021. - Т. 66 № 4. - С. 492-497

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirenskii Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620016, Russian Federation
Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ryabov, V. V.; Kargin, Y. F.; Chumilina, L. G.; Denisov, V. M.
}
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Crystal structure, luminescence, and thermodynamic properties of Pb10–xEux(GeO4)2+x(VO4)4–x (x = 0.1, 0.2, 0.3) substituted apatites / L. T. Denisova, M. S. Molokeev, A. S. Aleksandrovskii [et al.] // Inorg. Mater. - 2021. - Vol. 57, Is. 11. - P. 1158-1166, DOI 10.1134/S0020168521110030. - Cited References: 26. - This work was supported in part by the Russian Federation Ministry of Science and Higher Education as part of the state research target for the Siberian Federal University federal state autonomous educational institution of higher education, project no. FSRZ-2020-0013 . - ISSN 0020-1685
Кл.слова (ненормированные):
apatites -- lead europium germanatovanadates -- X-ray diffraction -- structure -- luminescence -- high-temperature heat capacity
Аннотация: Pb10 – xEux(GeO4)2 + x(VO4)4 – x (x = 0.1, 0.2, 0.3) Eu-substituted lead germanatovanadates with the apatite structure have been prepared by solid-state reactions, via firing in air in the temperature range 773–1073 K, using oxides (PbO, Eu2O3, GeO2, and V2O5) as starting materials. Using X-ray diffraction, we have determined the hexagonal cell parameters (sp. gr. P63/m) of the synthesized phases and refined their crystal structure (the atomic position coordinates, isotropic thermal parameters, and principal bond lengths in their structure are presented). We have measured the luminescence spectra of the Pb10 – xEux(GeO4)2 + x(VO4)4 – x (x = 0.1, 0.2, 0.3) apatites and shown that europium concentration has little effect on the shape of the luminescence spectra. Using experimental heat capacity data obtained for polycrystalline samples by differential scanning calorimetry in the temperature range 350–1050 K, we calculated the main thermodynamic functions of the Eu-substituted lead germanatovanadates.

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Публикация на русском языке Кристаллическая структура, люминесцентные и термодинамические свойства замещенных апатитов Pb10 – xEux(GeO4)2 + x(VO4)4 – x (x = 0.1, 0.2, 0.3) [Текст] / Л. Т. Денисова, М. С. Молокеев, А. С. Александровский [и др.] // Неорган. матер. - 2021. - Т. 57 № 11. - С. 1226-1234

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center (Federal Research Center), Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 119334, Russian Federation

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovskii, A. S.; Александровский, Александр Сергеевич; Kargin, Y. F.; Golubeva, E. O.; Denisov, V. M.
}
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    Disorder and phase transitions in oxyfluoride (NH4)(3)Ta(O-2)(2)F-4 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2011. - Vol. 132, Is. 10. - P. 713-718, DOI 10.1016/j.jfluchem.2011.05.012. - Cited Reference Count: 19. - Гранты: This work was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). - Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2] . - ISSN 0022-1139
Рубрики:
HEAT-CAPACITY
   COMPLEXES
   RB2KTIOF5
   FLUORIDES
   CRYOLITE
Кл.слова (ненормированные):
cubic oxyfluorides -- structural disorder -- phase transitions -- entropy -- permittivity -- pressure effect -- cubic oxyfluorides -- entropy -- permittivity -- phase transitions -- pressure effect -- structural disorder
Аннотация: Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)(3)Ta(O-2)(2)F-4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. (C) 2011 Elsevier By. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
RAS, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
}
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    Effect of a restricted geometry on thermal and dielectric properties of NH4HSO4 ferroelectric / E. A. Mikhaleva [et al.] // Ferroelectrics. - 2017. - Vol. 513, Is. 1. - P. 44-50, DOI 10.1080/00150193.2017.1350436. - Cited References:17. - The reported study was partially supported by the Russian Foundation for Basic Research (RFBR), research project No. 16-32-00092 mol_a. . - ISSN 0015-0193. - ISSN 1563-5112
   Перевод заглавия: Влияние ограниченной геометрии на тепловые и диэлектрические свойства сегнетоэлектриков NH4HSO4

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   AMMONIUM
   CAPACITY
   SULFATE
   KH2PO4
Кл.слова (ненормированные):
Ferroelectric -- phase transition -- porous glass -- nanocomposite
Аннотация: Heat capacity, thermal dilatation, sensitivity to pressure and permittivity of NH4HSO4 embedded into glass matrices with a pore size of 320 nm and 46 nm were studied. Large difference in the thermal expansion of both glass and ferroelectric leads to a "clamped" state of NH4HSO4 in nanocomposites and to the phase transition temperatures change. The restricted geometry does not effect on the order of successive transformations in NH4HSO4 but is accompanied by a significant reduction in entropy of phase transitions. The behavior of DTA-signal and permittivity show the expansion of the temperature range of the ferroelectric phase under hydrostatic pressure.

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Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Korotkov, L. N.; Rysiakiewicz-Pasek, E.; Russian Foundation for Basic Research (RFBR) [16-32-00092 mol_a]; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan)
}
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Effect of deuteration on phase transitions in (NH4)3VOF5 / E. V. Bogdanov, V. S. Bondarev, M. V. Gorev [et al.] // Phys. Solid State. - 2022. - Vol. 64, Is. 3. - P. 394-399, DOI 10.21883/PSS.2022.03.53195.237. - Библиогр.: 26 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
oxyfluorides -- phase transitions -- heat capacity -- thermal expansion -- pressure
Аннотация: The (ND4)3VOF5 crystal was grown with a high degree of deuteration (D≈92%). Structural and thermophysical studies have been carried out, the parameters of phase transitions have been determined. It was found that the deuteration of the ammonium cation in (NH4)3VOF5 led to a change in the chemical pressure, which was accompanied by an increase in the unit cell volume and an increase in the phase transition temperatures. The baric coefficients dTi/dp were determined and the phase T−p diagram (ND4)3VOF5 was constructed. A decrease in the temperature stability of the initial cubic phase Fm3¯m in (ND4)3VOF5, as well as a wedging out of the intermediate monoclinic phase at a lower pressure as compared to (NH4)3VOF5, was found.

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Публикация на русском языке Влияние дейтерирования на фазовые переходы в (NH4)3VOF5 [Текст] / Е. В. Богданов, В. С. Бондарев, М. В. Горев [и др.] // Физ. тверд. тела. - 2022. - Т. 64 Вып. 3. - С. 388-393

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, Russia

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич
}
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10.

Effect of the size of the central atom on the stability of crystalline phases in solid solutions (NH4)3TixSn1-xF7 / E. V. Bogdanov, E. I. Pogoreltsev, M. V. Gorev [et al.] // J. Solid State Chem. - 2023. - Vol. 328. - Ст. 124373, DOI 10.1016/j.jssc.2023.124373. - Cited References: 20. - The study was supported by a grant from the Russian Science Foundation № 23-22-00115, https://rscf.ru/project/23-22-00115/. - X-ray and dilatometric data and SEM images were obtained using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center — Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences. We are grateful to Dr. A.V. Shabanov for examination of the SEM images . - ISSN 0022-4596. - ISSN 1095-726X
Кл.слова (ненормированные):
Phase transition -- Fluorides -- Heat capacity -- Entropy -- Thermal expansion -- Birefringence -- Solid solution -- Internal pressure
Аннотация: The effect of a change in internal pressure as a result of partial substitution of the central atom on the realization and stability of the initial and distorted crystalline phases in (NH4)3TixSn1-xF7 solid solutions has been studied. It was found that at a Ti concentration in the range of x = 0.15–0.40, the reconstructive transition Pm-3m ↔ Pa-3 is transformed into a sequence of phase transitions Pm-3m ↔ P4/mbm ↔ P4/mnc ↔ Pa-3. In the (NH4)3Ti0.15Sn0.85F7 solid solution, the first-order phase transition between two cubic phases at T0 = 352 K is characterized by a significant volume jump δ(ΔV/V0) ≈ 1 %, comparable with that in (NH4)3SnF7. An increase of the Ti concentration leads to a strong decrease in the stability of the Pm-3m cubic phase: the first tetragonal P4/mbm phase appears in (NH4)3Ti0.4Sn0.6F7 at T0 = 400 K, which proves the existence of the predicted high-temperature cubic phase in (NH4)3TiF7. In solid solutions, a decrease in birefringence and entropy of phase transitions was observed in comparison with the initial compounds with Sn and Ti as central atoms. The role of critical parameters (unit cell volume, temperature, external pressure) in the formation of cubic and distorted phases is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049, Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074, Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Department of RAS, 690022, Vladivostok, Russia

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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11.

Fedorov, A. S.
Thermal properties of porous silicon nanomaterials / A. S. Fedorov, A. S. Teplinskaia // Materials. - 2022. - Vol. 15, Is. 23. - Ст. 8678, DOI 10.3390/ma15238678. - Cited References: 50. - This study was funded by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-0008 . - ISSN 1996-1944
Кл.слова (ненормированные):
porous silicon -- aerogel -- thermal properties -- heat capacity -- molecular dynamics
Аннотация: The thermal properties, including the heat capacity, thermal conductivity, effusivity, diffusivity, and phonon density of states of silicon-based nanomaterials are analyzed using a molecular dynamics calculation. These quantities are calculated in more detail for bulk silicon, porous silicon, and a silicon aerocrystal (aerogel), including the passivation of the porous internal surfaces with hydrogen, hydroxide, and oxygen ions. It is found that the heat capacity of these materials increases monotonically by up to 30% with an increase in the area of the porous inner surface and upon its passivation with these ions. This phenomenon is explained by a shift of the phonon density of states of the materials under study to the low-frequency region. In addition, it is shown that the thermal conductivity of the investigated materials depends on the degree of their porosity and can be changed significantly upon the passivation of their inner surface with different ions. It is demonstrated that, in the various simulated types of porous silicon, the thermal conductivity changes by 1–2 orders of magnitude compared with the value for bulk silicon. At the same time, it is found that the nature of the passivation of the internal nanosilicon surfaces affects the thermal conductivity. For example, the passivation of the surfaces with hydrogen does not significantly change this parameter, whereas a passivation with oxygen ions reduces it by a factor of two on average, and passivation with hydroxyl ions increases the thermal conductivity by a factor of 2–3. Similar trends are observed for the thermal effusivities and diffusivities of all the types of nanoporous silicon under passivation, but, in that case, the changes are weaker (by a factor of 1.5–2). The ways of tuning the thermal properties of the new nanostructured materials are outlined, which is important for their application.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Teplinskaia, A. S.; Федоров, Александр Семенович
}
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12.

Flerov, I. N.
Heat capacity and p-T phase diagrams of the ordered perovskites Pb2MgWO6 and Pb2CoWO6 / I. N. Flerov, M. V. Gorev, P. . Sciau // J. Phys.: Condens. Matter. - 2000. - Vol. 12, Is. 5. - P. 559-567, DOI 10.1088/0953-8984/12/5/304. - Cited References: 25 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   X-RAY
   TRANSITIONS
   PRESSURE
Аннотация: The heat capacities of Pb2MgWO6 and Pb2CoWO6 and the effect of hydrostatic pressure on the phase transitions have been studied on powdered samples by means of an adiabatic calorimeter and DTA performed under pressure, respectively. Thermodynamic parameters, such as change of total excess entropy, latent hear and hysteresis of the phase transition temperature were determined. Entropies and p-T phase diagrams are discussed in connection with structural data.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
CNRS, CEMES, F-31055 Toulouse, France
ИФ СО РАН
L V Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
CEMES-CNRS, 29 rue Jeanne Marvig, 31055 Toulouse, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Sciau, P.; Флёров, Игорь Николаевич
}
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13.

Flerov, I. N.
Heat capacity and phase transitions in NH4LiSO4, Cs-x(NH4)(1-x) LiSO4, and RbLiSO4 / I. N. Flerov, A. V. Kartashev, V. A. Grankina // Phys. Solid State. - 2005. - Vol. 47, Is. 4. - P. 720-728, DOI 10.1134/1.1913987. - Cited References: 29 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ROOM-TEMPERATURE
   MONTE-CARLO
   LINH4SO4
   SUBSTITUTION
   CRYSTALS
   SULFATE
   CSLISO4
Аннотация: The heat capacity of NH4LiSO4, RbLiSO4, and Cs-x(NH4)(1 - x) LiSO4 crystals and its behavior over a broad temperature range including the phase transition regions were studied. The entropy changes corresponding to structural transformations in these crystals were found not to be characteristic of straightforward ordering of structural blocks. The results obtained are discussed in terms of phenomenological theory and model concepts. (C) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Grankina, V. A.; Флёров, Игорь Николаевич
}
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14.

Gorev, M. V.
Heat capacity and the p-T phase diagram of Pb2MgTeO6 elpasolite / M. V. Gorev, I. N. Flerov, P. . Sciau // Phys. Solid State. - 2001. - Vol. 43, Is. 2. - P. 345-349, DOI 10.1134/1.1349486. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ORDERED PEROVSKITE PB2MGTEO6
   CRYSTAL-STRUCTURE
   PB2COWO6
   PB2MGWO6
Аннотация: The heat capacity of Pb2MgTeO6 is measured in the temperature range 80-300 K. It is found that the heat capacity exhibits an anomaly associated with the phase transition at T-0 = 186.9 K. The thermodynamic parameters of the structural transformation are determined. The effect of hydrostatic pressure up to 0.5 GPa on the phase transition temperature is examined. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
CNRS, Ctr Mat Improvement & Struct Invest, F-31055 Toulouse, France
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
CNRS Ctr. for Mat. I., Tuluza, 31055, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Sciau, P.; Горев, Михаил Васильевич
}
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15.

Gorev, M. V.
Heat capacity of PMN near an electric-field-induced phase transition / M. V. Gorev, V. S. Bondarev, K. S. Aleksandrov // JETP Letters. - 2007. - Vol. 85, Is. 6. - P. 283-285, DOI 10.1134/S0021364007060045. - Cited References: 9 . - ISSN 0021-3640
Аннотация: The heat capacity of a single crystal of Pb(Mg1/3Nb2/3)O-3 (PMN) in an electric filed with E = 3 kV/cm applied along the [111] direction has been measured using adiabatic calorimetry over the temperature range 170-250 K. Anomalies in C-P have been found, which correspond to a field-induced phase transition from a relaxor to a ferroelectric state at 225 K under field cooling conditions or at 235-240 K on the subsequent field heating. The field-induced ferroelectric phase persists in a metastable state at low temperatures and is destroyed on zero-field heating at 210 K. The small entropy change Delta S approximate to 0.028R in the field-induced phase transition suggests an insignificant change in the volume fraction of existing polar nanoregions.

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Публикация на русском языке Горев, Михаил Васильевич. Исследование теплоемкости PMN вблизи индуцированного электрическим полем фазового перехода [Текст] / М. В. Горев, В. С. Бондарев, К. С. Александров // Письма в Журн. эксперим. и теор. физ. - 2007. - Т. 85 Вып. 5-6. - С. 340-342

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Горев, Михаил Васильевич
}
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16.

Gorev, M. V.
Heat capacity study of PMN near field induced phase transition / M. V. Gorev, V. S. Bondarev, K. S. Aleksandrov // Abstract book of The Fifth International Seminar on Ferroelactic Physics. - 2006. - P. 104

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Горев, Михаил Васильевич; International Seminar on Ferroelactic Physics(5 ; 2006 ; Sept. ; 10-13 ; Voronezh)
}
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17.

Gorev, M. V.
Heat capacity study of PMN near fieldinduced phase transition / M. V. Gorev, V. S. Bondarev, K. S. Aleksandrov // Ferroelectrics. - 2007. - Vol. 360, Is. 1, Pt. 2. - P. 37-43, DOI 10.1080/00150190701515964. - Cited References: 11 . - ISSN 0015-0193
Кл.слова (ненормированные):
Field-induced phase transition -- Heat capacity -- PMN -- Field cooling -- Field model -- Field-induced phase transition -- Heat capacities -- Heat capacity measurements -- Single crystal wafers -- Temperature range -- Zero-field heating -- Electric fields -- Single crystals -- Specific heat -- Phase transitions
Аннотация: Heat capacity measurements were performed for a single crystal wafer of PMN in the temperature range of 170-250 K applying an electric field E = 3.0 kV/cm along the [111] direction. The heat capacity anomalies related to the phase transition at Tc = 210 K upon zero field heating after field cooling and at Tc = 223 K upon field cooling have been found. The results obtained are discussed together with the data of previous studies in the frame of the spherical random bondrandom field model.

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Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Горев, Михаил Васильевич; International Seminar on Ferroelactic Physics(5 ; 2006 ; Sept. ; 10-13 ; Voronezh)
}
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18.

Heat capacity and magnetic properties of fluoride CsFe2+Fe3+F6 with defect pyrochlore structure / M. V. Gorev [et al.] // J. Solid State Chem. - 2016. - Vol. 237. - P. 330-335, DOI 10.1016/j.jssc.2016.02.045. - Cited References: 19. - This study was partially supported by the Grant NSh-924.2014.2 of the President of the Russian Federation for the Support of Leading Scientific Schools. . - ISSN 0022-4596

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
Crystal-structure
   Mossbauer
   CsFe2F6
   Spectra
Кл.слова (ненормированные):
Pyrochlore structure -- Phase transition -- Magnetic properties -- Thermal properties
Аннотация: Heat capacity, Mossbauer and Raman spectra as well as magnetic properties of fluoride CsFe2F6 with defect pyrochlore structure were studied. In addition to recently found above room temperature three successive structural transformations Pnma-Imma-I41amd-Fd-3m, phase transition of antiferromagnetic nature with the 13.7 K Neel temperature and a broad heat capacity anomaly with a maximum at about 30 K were observed. The room temperature symmetry Pnma is unchanged at least down to 7 K. Simple model of indirect bond used to estimate the exchange interactions and to propose a magnetic structure model. © 2016 Elsevier Inc. All rights reserved.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian State University, Krasnoyarsk, Russian Federation
Institut de Chimie de la Matiere Condensee, ICMCB, CNRS, Universite Bordeaux, Pessac Cedex, France
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Bogdanov, E. V.; Богданов, Евгений Витальевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич
}
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19.

Heat capacity and magnetocaloric effect in manganites (La1-yEuy)(0.7)Pb0.3MnO3 (y:0.2; 0.6) / A. V. Kartashev [et al.] // J. Magn. Magn. Mater. - 2010. - Vol. 322, Is. 6. - P. 622-627, DOI 10.1016/j.jmmm.2009.10.026. - Cited Reference Count: 17. - Гранты: This work was supported by the Krasnoyarsk's regional sciences foundation and RFBR in the framework of project "Siberia''(Grant no. 09-02-98001), by Integrational project of Siberian and Far Eastern Departments of RAS(no. 101) and by Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools(Projectno. NSh-1011.2008.2). Dr Maxim S. Molokeev is acknowledged for the X-raycharacterization of the samples. - Финансирующая организация: Krasnoyarsk's regional sciences foundation [09-02-98001]; Siberian and Far Eastern Departments [101]; Russian Federation [NSh-1011.2008.2] . - MAR. - ISSN 0304-8853
Рубрики:

Кл.слова (ненормированные):
Manganites -- Magnetic phase transition -- Heat capacity -- Magnetocaloric effect -- Heat capacity -- Magnetic phase transition -- Magnetocaloric effect -- Manganites -- Adiabatic calorimeters -- Heat capacities -- Magnetic phase transitions -- Magneto-caloric effects -- Magnetocaloric effect -- Multi-element -- Nonmagnetics -- Relative cooling power -- Temperature range -- Europium -- Lead -- Manganese compounds -- Oxide minerals -- Specific heat -- Phase transitions
Аннотация: Heat capacity and intensive magnetocaloric effect (MCE) in manganites (La1-yEuy)(0.7)Pb0.3MnO3[y=0.2; 0.6] (LEPM) were investigated by means of adiabatic calorimeter. The heat capacity anomaly as well as the values of both the intensive (Delta T-AD) and the extensive (Delta S-MCE) MCE were found to decrease upon increased replacement of La with nonmagnetic Eu. However, because of widening of the MCE peaks, the LEPM compounds show the relative cooling power, RCP/Delta H, comparable to other solid solutions of manganites. Owing to strong effect of Eu -> La substitution on the Curie temperature, LEPM might have potential as the solid state refrigerants in multi-element cooling apparatus operating in a wide temperature range. (C) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Volkov, N. V.; Волков, Никита Валентинович; Sablina, K. A.; Саблина, Клара Александровна
}
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20.

Heat capacity and magnetocaloric effect in manganites (La1-yEuy)0.7Pb0.3MnO3 (y = 0.2; 0.6) / Kartasev A.V. [и др.] // Moscow Int. Symp. on Magnet. (MISM-2008) : June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст. 24PO-7-25. - p. 639-640. - Библиогр.: 1. - Support by the Council of Grants from the President of the Russian Federation for Support of Leading Scientific Schools (project no. NSh -1011.2008.2) is acknowledged

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Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Volkov, N. V.; Волков, Никита Валентинович; Sablina, K. A.; Саблина, Клара Александровна; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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