Труды сотрудников института физики

/ I. N. Flerov [и др.] // Ferroelectrics. - 1993. - Vol. 143, Is. 1. - P. 11-16, DOI 10.1080/00150199308008307 . - ISSN 0015-0193
Аннотация: Investigations of twinning, birefringence, heat capacity, effect both of deuteration and of hydrostatic pressure were carried out on crystals of ABF6-6H2O family. The high-temperature and high-pressure phases were found in some compounds. The hypothetic p-T phase diagram was suggested describing the variety of phases observed up to now in this family of crystals.

Смотреть статью


Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Afanasyev, M. L.; Афанасьев, Михаил Лаврентьевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич

/ I. N. Flerov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 6. - P. 1149-1156, DOI 10.1134/S1063783407060212. - Cited References: 11 . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: The thermal properties and structure of (ND4)(2)WO2F4 crystals are investigated. It is established that deuteration does not lead to a change in the symmetry of the initial phase Cmcm but considerably decreases the extent of its disordering, which, in turn, brings about a substantial decrease in the phase transition entropy. Apart from the anomalies associated with phase transitions characteristic of the protonic compound, the heat capacity exhibits two additional anomalies. Analysis of the phase diagram of the deuterated crystal reveals a triple point at a pressure p = 0.18 GPa, which is predicted for (NH4)(2)WO2F4 at about 0.7 GPa.

WOS,
Scopus,
Для получение полного текста обратитесь в библиотеку

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

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Kocharova, A. G.; Кочарова, Алла Георгиевна

/ I. N. Flerov [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 10. - P. 1961-1966, DOI 10.1134/1.1514788. - Cited References: 11 . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: The heat capacity of partially deuterated crystals with a cryolite structure, namely, (NH4)(3)ScF6 and (NH4)(3)GaF6, is measured in the temperature range from 80 to 370 K. The p-T phase diagrams of these compounds are investigated at pressures up to p = 0.6 GPa. It is revealed that the deuteration does not affect the sequences of phase transitions observed in the proton-containing ammonium cryolites studied earlier. The isotope effect most clearly manifests itself in significant changes in the thermodynamic parameters of the I12/m1-P (1) over bar low-temperature transformation in scandium cryolite. (C) 2002 MAIK "Nauka/Interperiodica".

WOS,
Scopus,
Для получение полного текста обратитесь в библиотеку

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:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Afanas'ev, M. L.; Ushakova, T. V.

/ E. V. Bogdanov [et al.] // Inorg. Chem. - 2017. - Vol. 56, Is. 11. - P. 6706-6711, DOI 10.1021/acs.inorgchem.7b00811. - Cited References: 14. - We are grateful to A. G. Kocharova for preparation of the sample and Dr. A. M. Pugachev for examination of the second harmonic generation. This study was partially supported by the Russian Foundation for Basic Research (Project 16-32-00201mol_a). . - ISSN 0020-1669
   Перевод заглавия: Эффект дейтерирования на термодинамические свойства диоксотетрафлуоромолибдате (VI), (NH4)2MoO2F4
Аннотация: Thermal and dielectric studies of (ND4)2MoO2F4 crystals undergoing successive phase transitions at T1 = 272 K and T2 = 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS1 = R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T–p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of ptrp ≈ −0.8 GPa.

Смотреть статью,
Scopus,
WOS,
Для получение полного текста обратитесь в библиотеку

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
Institute of Engineering Physics and Radioelectronics, Siberian State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич

/ E. V. Bogdanov [et al.] // Ninth international seminar on ferroelastic physics (ISFP-9) : book of abstracts / org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2018. - P. 25

Материалы конференции,
Материалы конференции


Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; International Seminar on Ferroelastic Physics(9 ; 2018 ; Sept. ; 12-15 ; Voronezh); Международный семинар по физике сегнетоэластиков(9(14) ; 2018 ; сент. ; 12-15 ; Воронеж); Российская академия наук; Воронежский государственный технический университет

/ E. V. Bogdanov [et al.] // Phys. Solid State. - 2019. - Vol. 61, Is. 2. - P. 192-200, DOI 10.1134/S1063783419020082. - Cited References: 35. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: "Effect of deuterium on orientational ordering and phase transitions in ammonium fluorine oxygen vanadates," no. 18-42-243003. . - ISSN 1063-7834
Аннотация: The crystals of (ND4)3VO2F4 with a high degree of deuteration (~87%) have been grown and a significant (~1.5%) increase in the unit cell volume has been detected. The decrease in the chemical pressure leads to a change in the sequence of phase transitions due to wedging-out of one of the rhombic phases observed in (NH4)3VO2F4. The thermal physical studies have been carried out and the entropies, deformations, and pressure coefficients related to structural transformations have been determined. The T–p phase diagram has been built and the pressure and temperature boundaries of crystal phase stability have been determined. The dielectric studies demonstrate a nonferroelectric nature of the phase transitions in (ND4)3VO2F4. The experimental and model entropies are compared. Based on the decrease in the entropy as a result of deuteration, a hypothesis on significant but not limited anharmonism of vibrations of ammonia tetrahedral corresponding to the disordering is proposed.

Смотреть статью,
Scopus,
WOS,
Для получение полного текста обратитесь в библиотеку

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Systems and Energetics, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич

/ E. V. Bogdanov [et al.] // AOJ Mater. Devices. - 2019. - Vol. 4, Is. 1. - P24, DOI 10.23647/ca.md20191506. - Cited References: 2. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: «Effect of deuterium on orientational ordering and phase transitions in ammonium fluorine oxygen vanadates» № 18-42-243003. . - ISSN 2495-3911

Смотреть статью,
Для получение полного текста обратитесь в библиотеку

Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS, 660036, Krasnoyarsk, Russia
Krasnoyarsk State Agrarian University, 660049, Krasnoyarsk, Russia
Siberian Federal University, 660074, Krasnoyarsk, Russia

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; International Seminar on Ferroelastic Physics(9 ; 2018 ; Sept. ; 12-15 ; Voronezh)

/ E. V. Bogdanov, M. V. Gorev, I. N. Flerov // Solid State Sci. - 2022. - Vol. 133. - Ст. 107022, DOI 10.1016/j.solidstatesciences.2022.107022. - Cited References: 28 . - ISSN 1293-2558
Аннотация: We report on the analysis of intensive and extensive barocaloric properties and their sensitivity to deuteration of complex oxyfluorides (NH4)3VOxF6−x (x: 1, 2) undergoing a similar sequence of structural phase transitions. Due to the high sensitivity to hydrostatic pressure and the strong disordering of six-coordinated anionic fluoro-oxygen species, (NH4)3VO2F4 and (ND4)3VO2F4 crystals demonstrate the highest barocaloric efficiency at low pressure, p = 0.1 GPa, during the phase transition from the initial cubic phase: barocaloric coefficients reach large values |ΔSBCE|/p ≈ 400 J/(kg K GPa) and ΔTAD/p ≈ 80 K/GPa. Anionic, [VOF5] → [VO2F4], and cationic, [ND4] → [NH4] substitutions are accompanied by a decrease in the disorder of structural units in the cubic phase, which leads to a decrease in changes in entropy and temperature under pressure. The contribution of thermal expansion of the crystal lattice to the total intensive and extensive barocaloric effects is large and amounts to about 30–40%.

Смотреть статью,
Scopus

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Богданов, Евгений Витальевич

/ 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
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.

Смотреть статью,
Для получение полного текста обратитесь в библиотеку

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