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Anisotropy of piezocaloric effect at ferroelectric phase transitions in ammonium hydrogen sulphate / E. A. Mikhaleva, M. V. Gorev, M. S. Molokeev [et al.] // J. Alloys Compd. - 2020. - Vol. 839. - Ст. 155085, DOI 10.1016/j.jallcom.2020.155085. - Cited References: 31. - The reported study was supported by the Russian Science Foundation (project no. 19-72-00023 ). 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 0925-8388
Кл.слова (ненормированные):
Piezocaloric effect -- Phase transition -- Ferroelectrics -- Thermal expansion -- High-pressure -- Entropy
Аннотация: The role of anisotropy of the thermal expansion in formation of piezocaloric effect (PCE) near ferroelectric phase transitions in NH4HSO4 was studied. Strong difference in linear baric coefficients and as a result in intensive and extensive PCE associated with the different crystallographic axes was found. PCE giving the main contribution to the barocaloric effect were determined at both phase transitions. Rather strong effect of the lattice dilatation on the tuning of PCE was observed. Comparative analysis of PCE at the phase transitions in different materials showed that NH4HSO4 can be considered as a promising solid-state refrigerant. A hypothetical cooling cycle based on alternate using uniaxial pressure along two axes was considered.

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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
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич
}
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Anharmonicity and local noncentrosymmetric regions in BaTiO3 pressed powder studied by the Raman line temperature dependence / A. M. Pugachev, I. V. Zaytseva, N. V. Surovtsev, A. S. Krylov // Ceram. Int. - 2020. - Vol. 46, Is. 14. - P. 22619-22623, DOI 10.1016/j.ceramint.2020.06.024. - Cited References: 26. - The reported study was funded by RFBR , according to the research project No. 18-02-00399 and 19-42-543-016 , Government of Novosibirsk region No. 19-42-543-016 and State assignment No AAAA-A17-117052410033-9. The experiments were performed in the multiple-access center “High-Resolution Spectroscopy of Gases and Condensed Matter” in IA&E SB RAS (Novosibirsk, Russia) and Center for Common Use of the Krasnoyarsk Scientific Center, SB RAS (Krasnoyarsk, Russia) . - ISSN 0272-8842
Кл.слова (ненормированные):
BaTiO3 -- Non-hydrostatic pressure -- Raman scattering -- Anharmonicity -- Noncentrosymmetric regions
Аннотация: The temperature dependencies of position, width, and integral amplitude the E(TO) line near 307 cm−1 in Raman spectra in barium titanate powders with different non-hydrostatic pressure and temperature treatment were studied. It was found that parameters of the E(TO) line near 307 cm−1 are different in the crystal, the untreated powder, the powder treated by the non-hydrostatic pressure, and the powder annealed after the pressure treatment. The line width (FWHM) increase with temperature according to Klemens model. It indicates that the origin of the line broadening is the anharmonicity of the E(TO) phonons. The pressure treatment changes the anharmonicity of the phonon potential. It was found that the temperature dependence of the integral intensity of the E(TO) line is similar to that of the second optical harmonic signal and reflects the presence of the local polar regions. Thus, the E(TO) line in the Raman spectrum allows one to characterize the average polarity of local regions and their anharmonicity depending on non-hydrostatic pressures and thermal treatment.

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Держатели документа:
Institute of Automation and Electrometry SB RAS, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Pugachev, A. M.; Zaytseva, I. V.; Surovtsev, N. V.; Krylov, A. S.; Крылов, Александр Сергеевич
}
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    Magnetic transitions in exotic perovskites stabilized by chemical and physical pressure / Y. L. Ma, M. S. Molokeev, C. H. Zhu [et al.] // J. Mater. Chem. C. - 2020. - Vol. 8, Is. 15. - P. 5082-5091, DOI 10.1039/c9tc06976c. - Cited References: 79. - This work was financially supported by the National Science Foundation of China (NSFC-21801253, 11804404 and 21875287) and the National Science Foundation (NSF) Grant No. DMR-1809931. Structural analysis of exotic materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation. The XANES work at the Brookhaven National Laboratory, NSLS-II, was supported by the DOEBES (DE-SC0012704). The NSLS-II work was performed on beamline 7-BM and the authors gratefully acknowledge the invaluable help of the beamline scientists Steven Ehrlich and Syed Khalid. . - ISSN 2050-7526. - ISSN 2050-7534
   Перевод заглавия: Магнитный переход в экзотических перовскитах, стабилизированных химическим и физическим давлением

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
COLOSSAL MAGNETORESISTANCE
   CATION ORDER
   RMN3O6 R
   T-C
   TEMPERATURE
Аннотация: Exotic perovskites significantly enrich materials for multiferroic and magnetoelectric applications. However, their design and synthesis is a challenge due to the mostly required recipe conditions at extremely high pressure. Herein, we presented the Ca2−xMnxMnTaO6 (0 ≤ x ≤ 1.0) solid solutions stabilized by chemical pressure assisted with intermediate physical pressure up to 7 GPa. The incorporation of Mn2+ into the A-site neither drives any cationic ordering nor modifies the orthorhombic Pbnm structure, namely written as (Ca1−x/2Mnx/2)(Mn1/2Ta1/2)O3 with disordered A and B site cationic arrangements. The increment of x is accompanied by a ferromagnetic to antiferromagnetic transition around x = 0.2, which is attributed to the double-exchange interactions between A-site Mn2+ and B-site Mn3+. Partial charge disproportionation of the B-site Mn3+ into Mn2+ and Mn4+ occurs for x above 0.8 samples as manifested by X-ray spectrum and magnetic behaviors. The coexistence of B-site Mn3+ (Jahn–Teller distortion ion) and B′-site Ta5+ (second-order Jahn–Teller distortion ion) could be energetically responsible for the absence of A-site columnar ordering as observed in other quadruple perovskites with half of the A-sites occupied by small transition-metal cations. These exceptional findings indicate that exotic perovskites can be successfully stabilized at chemical and intermediate physical pressure, and the presence of Jahn–Teller distortion cations at the same lattice should be avoided to enable cationic ordering.

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Держатели документа:
Sun Yat Sen Univ, Sch Chem, Minist Educ, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA.
Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA.

Доп.точки доступа:
Ma, Yalin; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhu, Chuanhui; Zhao, Shuang; Han, Yifeng; Wu, Meixia; Liu, Sizhan; Tyson, Trevor A.; Croft, Mark; Li, Man-Rong
}
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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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Size effect on sensitivity to external pressure and caloric effects in TGS: Ceramics and nanocomposites / E. A. Mikhaleva, I. N. Flerov, E. V. Bogdanov [et al.] // Mater. Today Commun. - 2020. - Vol. 25. - Ст. 101463, DOI 10.1016/j.mtcomm.2020.101463. - Cited References: 39 . - ISSN 2352-4928
Кл.слова (ненормированные):
Ferroelectric nanocomposite -- Phase transition -- High pressure -- Caloric effects
Аннотация: Experimental study of temperature-pressure phase diagrams revealed a slight difference in the sensitivity to hydrostatic pressure of triglycine sulfate (TGS) as a bulk (single crystal, ceramics), and nanoparticles embedded in porous glass (TGS + PG). An analysis of the pressure sensitivity, dT0/p and dT0/dσ, and entropies of the P21 ↔ P21/m phase transition showed the closeness of the barocaloric parameters in various materials under study. Due to the strong anisotropy of thermal expansion, the piezocaloric effect under pressure along the axis c exceeds the barocaloric effect in single-crystal TGS. The reasons for the strong reduction in the electrocaloric effect in the ferroelectric component of nanocomposites compared with a single-crystal are discussed.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Department of Experimental Physics, Wroclaw University of Science and Technology, Wroclaw, 50-370, Poland

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Rysiakiewicz-Pasek, E.
}
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Single particle Raman spectroscopy analysis of the metal-organic framework DUT-8(Ni) switching transition under hydrostatic pressure / A. Krylov, I. Senkovska, S. Ehrling [et al.] // Chem. Commun. - 2020. - Vol. 56, Is. 59. - P. 8269-8272, DOI 10.1039/d0cc02491k. - Cited References: 40. - This work is financially supported by the Russian Foundation for Basic Research No18-02-00754 and German research foundation (FOR 2433, MOF-switches). The authors would like to thank Dr. V. Bon for support and scientific discussions . - ISSN 1364-548X
Аннотация: Experimental in situ observations of phase coexistence in switchable metal-organic frameworks are reported to provide a fundamental understanding of dynamic adsorbents that can change their pore structure in response to external stimuli. A prototypical flexible pillared layer framework DUT-8(Ni) (DUT = Dresden University of Technology) was studied under hydrostatic pressure by in situ Raman spectroscopy on single crystals. The closing transition of the open pore phase (op) containing DMF in the pores in silicon oil as a pressure transmitting fluid, as well as the closed pore phase (cp) to op transition under pressure in methanol, were studied. Phase coexistences during both transitions were observed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Chair of Inorganic Chemistry I, Technische Universitat Dresden, Bergstrasse 66, 01069 Dresden, Germany
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Senkovska, I.; Ehrling, S.; Maliuta, M.; Krylova, S. N.; Крылова, Светлана Николаевна; Slyusareva, E.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Kaskel, S.
}
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Thermodynamic properties of vanadium oxypentafluoride (IV) (NH4)3VOF5 / E. V. Bogdanov, E. I. Pogoreltsev, A. V. Kartashev [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P. 1271-1279, DOI 10.1134/S1063783420070057. - Cited References: 17. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 18-42-243003 “Effect of Deuteration on Orientational Ordering and Phase Transitions in Ammonium Fluorine-Oxygen Vanadates” . - ISSN 1063-7834
Кл.слова (ненормированные):
oxyfluorides -- phase transitions -- specific heat -- birefringence -- thermal expansion -- pressure susceptibility
Аннотация: The (NH4)3VOF5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temperature dependences of specific heat, entropy, strain, and pressure susceptibility show the occurrence of three phase transitions caused by the structural transformations in the (NH4)3VOF5 crystals. The T–p phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH4)3VOF5. The optical and dielectric studies disclose the ferroelastic nature of the phase transitions. An analysis of the experimental data together with the data on the isostructural (NH4)3VO2F4 crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V).

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Публикация на русском языке Термодинамические свойства оксипентафторида ванадия (IV), (NH4)3VOF5 [Текст] / Е. В. Богданов, Е. И. Погорельцев, А. В. Карташев [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 7. - С. 1123-1131

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Agrarian University, Institute of Engineering Systems and Power, Krasnoyarsk, 660049, Russian Federation
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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    The effect of microstructural features on the ferromagnetism of nickel oxide nanoparticles synthesized in a low-pressure arc plasma / A. V. Ushakov, I. V. Karpov, L. Y. Fedorov [et al.] // Physica E. - 2020. - Vol. 124. - Ст. 114352, DOI 10.1016/j.physe.2020.114352. - Cited References: 31. - The work was performed with a support of the grant of the Russian Science Foundation (Project No. 16-19-10054 ). The electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation . - ISSN 1386-9477
   Перевод заглавия: Влияние особенностей микроструктуры на ферромагнетизм наночастиц оксида никеля, синтезированных в дуговой плазме низкого давления
Кл.слова (ненормированные):
Nickel oxide -- Nanoparticles -- Band gap -- Magnetic properties
Аннотация: Nickel oxide nanoparticles were first synthesized by sputtering high-purity nickel in an oxygen plasma of a low-pressure arc discharge. The structure, morphology, and optical and magnetic properties of NiO nanoparticles were studied by XRD, TEM, FTIR, UV-VIS, and VSM. TEM images showed that the obtained NiO nanoparticles have a narrow particle size distribution and an average particle size of 12 nm. The XRD results and the processing of diffractograms by the Rietveld method showed that the obtained nanoparticles have a face-centered cubic lattice with an average particle size of 13 nm. With decreasing temperature, residual stresses increase and peaks corresponding to the superstructure appear. The band gap of NiO was determined from the optical absorption spectrum and amounted to 3.21 eV. Magnetic measurements showed that, at temperatures of 200 and 300 K, NiO nanoparticles, unlike bulk particles, exhibit ferromagnetic behavior, and at 5 K a magnetic hysteresis loop appears. Based on the studies, a dendritic model of the nanoparticle microstructure is proposed.

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Держатели документа:
Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ushakov, A. V.; Karpov, I. V.; Fedorov, L. Y.; Demin, V. G.; Goncharova, E. A.; Shaihadinov, A. A.; Zeer, G. M.; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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    Magnetism in spin crossover systems: Short-range order and effects beyond the Heisenberg model / V. I. Kuz'min [et al.] // Phys. Rev. B. - 2019. - Vol. 100, Is. 14. - Ст. 144429, DOI 10.1103/PhysRevB.100.144429. - Cited References: 72. - The authors thank the Russian Scientific Foundation for the financial support under Grant No. 18-12-00022. . - ISSN 2469-9950. - ISSN 2469-9969
   Перевод заглавия: Магнетизм в системах со спиновыми кроссоверами: ближний порядок и эффекты за пределами модели Гейзенберга

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
LOWER-MANTLE
   STATE
   TRANSITION
   PRESSURE
   IRON
   SUSCEPTIBILITY
Аннотация: To study non-Heisenberg effects in the vicinity of spin crossover in strongly correlated electron systems we derive an effective low-energy Hamiltonian for the two-band Kanamori model. It contains a Heisenberg high-spin term proportional to exchange constant as well as a low-spin term proportional to spin gap parameter ɛs. Using cluster mean field theory we obtain several non-Heisenberg effects. Near the critical value of spin gap ɛcs there is a magnetic phase transition of first order. In the vicinity of ɛcs in the paramagnetic phase we observe nontrivial behavior of the Curie constant in the paramagnetic susceptibility in the wide range of temperature. Reentrant temperature behavior of nearest-neighbor spin-spin correlations is observed at ɛsɛcs. Finally, the pressure-temperature magnetic phase diagram for ferroperriclase is obtained using the effective Hamiltonian.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Sukhachov Inst Forest, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Zarubin, A. E.; Ovchinnikova, T. M.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Scientific FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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10.

    Pressure-Induced Structural Transition to the Polar Phase in GdFe3(BO3)4 / I. S. Lyubutin [et al.] // Cryst. Growth Des. - 2019. - Vol. 19, Is. 12. - P. 6935-6944, DOI 10.1021/acs.cgd.9b00609. - Cited References: 39. - The authors express their deep gratitude to Prof. S. G. Ovchinnikov for initiating this work and fruitful discussions. These studies were performed with the support of the Ministry of Science and Higher Education within the State assignment FSRC "Crystallography and Photonics" RAS in part for the synchrotron Mössbauer measurements. Support from RFBR Grant No. 17-02-00766 in part for the Raman spectroscopy measurements and from No. 18-02-00696 in part for the theoretical calculations is also acknowledged. For preparation and tests of high-pressure cells, (39) the facilities of Center for Collective Use “Accelerator Center for Neutron Research of the Structure of Substance and Nuclear Medicine” of the INR RAS were used. . - ISSN 1528-7483
   Перевод заглавия: Индуцированный давлением структурный переход в полярную фазу в GdFe3(BO3)4
Кл.слова (ненормированные):
Boron -- Crystal lattices -- Ferroelectricity -- Ions -- Iron compounds
Аннотация: The GdFe3(BO3)4 crystal has attracted great interest as a magnetic-field-induced multiferroic. In this paper, we show that the multiferroic properties in this crystal can be induced by high pressure. At high pressures up to 50 GPa, created in diamond anvil cells, the structural and vibrational (phonon) properties of the GdFe3(BO3)4 crystal were studied. The structural phase transition was detected at about 23–25 GPa by Raman and synchrotron Mössbauer (NFS) spectroscopy. First-principle calculations of the crystal lattice dynamics at pressures below and above the structural transition were carried out. It was established that at pressures above the structural transition, the space group R32 of GdFe3(BO3)4 is changed to the polar space group R3, and the crystal becomes a ferroelectric. At the R32 → R3 transition, the displacement of the boron ion B(2) and oxygen O results in the formation of boron–oxygen B(2)O4 tetrahedrons instead of the plane BO3 triangles. Meanwhile, the triangle oxygen environment of boron in the site B(1) remains unchanged. The nearest environment of the gadolinium ion also changes significantly. Instead of six oxygen ions in the R32 phase, the nearest surroundings of Gd in the R3 phase consist of nine oxygen ions forming a complex polyhedron. A large hysteresis of the transition indicates that this crystal remains a ferroelectric with a decrease in pressure to about ambient pressure.

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Держатели документа:
Shubnikov Institute of Crystallography of FSRC Crystallography and Photonics RAS, Moscow, 119333, Russian Federation
Institute for Nuclear Research, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
REC Functional Nanomaterials, Immanuel Kant Baltic Federal University, Kaliningrad, 236041, Russian Federation

Доп.точки доступа:
Lyubutin, I. S.; Gavriliuk, A. G.; Andryushin, N. D.; Андрюшин, Никита Дмитриевич; Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Zinenko, V. I.; Зиненко, Виктор Иванович; Lyubutina, M. V.; Troyan, I. A.; Smirnova, E. S.
}
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11.

Heat capacity, thermal expansion and sensitivity to hydrostatic pressure of (NH 4 ) 3 SiF 7 at successive structural phase transitions / E. V. Bogdanov [et al.] // J. Solid State Chem. - 2019. - Vol. 276. - P. 152-158, DOI 10.1016/j.jssc.2019.04.029. - Cited References: 20 . - ISSN 0022-4596
Кл.слова (ненормированные):
Phase transition -- Fluorides -- Heat capacity -- Entropy -- Thermal expansion -- High pressure
Аннотация: Heat capacity, thermal dilatation, permittivity and sensitivity to external pressure of (NH4)3SiF 7 were studied. Due to the absence of cubic phases Pm3¯m and Pa3¯, a strong decrease in the total entropy change ∑ΔSi =19 J/mol K associated with four successive transformations P4/mbm↔Pbam↔P2 1 /c11↔P1¯↔P12 1 /c1 was found in silicate in comparison with other double fluoride salts (NH4)3MeF7 (Me: Ge, Ti, Sn) Using analysis of the excess heat capacity in the framework of the thermodynamic theory, the entropies associated with each individual phase transition were determined. In accordance with the entropic parameters, the complete ordering of the structural elements occurs in the monoclinic phase P21/c11. Further change in symmetry is associated with small entropy changes which prove insignificant displacement of structural units. A T−p phase diagram was constructed and good agreement was found between measured and calculated baric coefficients. © 2019 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, 660049, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation
Institute of Chemistry, Far Eastern Department of RAS, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Laptash, N. M.; Flerov, I. N.; Флеров, Игорь Николаевич
}
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12.

    Processes and conditions of the origin for Fe3+-bearing magnesiowustite under lithospheric mantle pressures and temperatures / Y. Bataleva [et al.] // Minerals. - 2019. - Vol. 9, Is. 8. - Ст. 474, DOI 10.3390/min9080474. - Cited References: 82. - This research was performed by state assignment of IGM SB RAS (project No. 0330-2016-0007). . - ISSN 2075-163X
   Перевод заглавия: Процессы и условия зарождения магнезиовюстита, несущего Fe3+, при давлении и температуре литосферной мантии
Рубрики:
Mineral Geochemistry and Geochronology
Кл.слова (ненормированные):
Fe3+-bearing magnesiowustite -- Mantle oxides -- Experimental modeling -- High-pressure experiment -- Redox reactions -- Lithospheric mantle -- Diamond -- Graphite
Аннотация: An experimental study, implicated in the revealing of the conditions for the origin for Fe3+-bearing magnesiowüstite in the lithospheric mantle, was performed using Mössbauer spectroscopy of pre-synthesized samples. Experiments were carried out using a multi-anvil high-pressure split-sphere apparatus at 6.3–7.5 GPa, in the range of 1100–1650 °C in carbonate-metal, carbonate–oxide-metal, carbonate-oxide, carbide-oxide and carbonate–metal-sulphur systems. In three experimental series, oxygen fugacity gradient in the samples was created, which enabled the study of the processes of magnesiowüstite formation under oxidizing and reducing conditions (ΔlogfO2 (FMQ) values from −1 to −5). It was established that Fe3+-bearing magnesiowüstite can form both in assemblage with oxidized phases, such as carbonate or with reduced ones—metal, carbides, sulphides, graphite and diamond. According to the Mössbauer spectroscopy, the composition of synthesized magnesiowüstite varied within a range of Fe3+/ΣFe values from 0 to 0.3, with IV and VI coordination of Fe3+ depending on P, T, fO2, x-parameters. It was established that Fe3+-bearing magnesiowüstite formation processes under upper mantle P,T-conditions include redox reactions, with magnesiowüstite being (1) reductant or (2) product of interaction, (3) crystallization processes of magnesiowüstite from an oxidized melt, where magnesiowüstite acts as a sink for ferric iron and (4) iron disproportionation.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptyug ave 3, Novosibirsk, 630090, Russian Federation
Department of Geology and Geophysics, Novosibirsk State University, Pirogova str 2, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Bataleva, Y.; Palyanov, Y.; Borzdov, Y.; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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13.

Physical properties of a frustrated uasi-one-dimensional NaCuFe2(VO4)3 magnet and effect of chemical pressure induced by the substitution of sodium for lithium / T. V. Drokina, G. A. Petrakovskii, O. A. Bayukov [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 2. - P. 297-307, DOI 10.1134/S1063783420020122. - Cited References: 22 . - ISSN 1063-7834
Кл.слова (ненормированные):
multicomponent vanadates -- structural features -- magnetic properties -- phase transitions -- chemical pressure
Аннотация: The structural, thermal, static magnetic, and resonance properties of the low-dimensional NaCuFe2(VO4)3 compound obtained by the solid-phase synthesis have been investigated. In the temperature range of 110–300 K, the electron spin resonance in the X band with a g factor of 2.008 has been detected. The magnetic properties of a sample with a high frustration level in the paramagnetic, antiferromagnetic, and disordered states have been examined. A shift of the Neel temperature to the high-temperature region in an external magnetic field has been observed. The origin of the disordered magnetism in NaCuFe2(VO4)3 are discussed. The features of substitution of sodium for lithium on the physical properties of the ACuFe2(VO4)3 (A = Na, Li) system have been established. It is shown that the chemical pressure changes the crystal lattice parameters, spacings between magnetic ions, and crystallite size, which is reflected in the physical properties of the material.

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Публикация на русском языке_ Физические свойства фрустрированного квазиодномерного магнетика NaCuFe2(VO4)3 и влияние химического давления при замещении натрия литием [Текст] / Т. В. Дрокина [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 2. - С. 247-256

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Drokina, T. V.; Дрокина, Тамара Васильевна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bayukov, O. A.; Баюков, Олег Артемьевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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14.

Gavrichkov, V. A.
Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 9. - Ст. 094409, DOI 10.1103/PhysRevB.101.094409. - Cited References: 65. - We acknowledge the support of the Russian Science Foundation through Grant No. 18-12-00022 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
EXCHANGE INTERACTION
   PHASE-TRANSITIONS
   STATE
   ELECTRON
   IRON
Аннотация: We derived simple rules for the sign of 180° superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of partial contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the 180° superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 until d8: the iron, cobalt, chromium, nickel, copper, and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the 180∘ superexchange interaction.

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Держатели документа:
Kirensky Inst Phys, Akadeingorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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15.

    Gavrichkov, V. A.
    Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2019. - Ст. 1911.06482. - Cited References: 63. - We acknowledge the support of the Russian Science Foundation through Grant 18-12-00022.
Рубрики:
Materials Science
   Strongly Correlated Electrons
Аннотация: We derived simple rules for the sign of superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of individual contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 till d8: the iron, cobalt, chromium, nickel, copper and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the superexchange interaction.

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Держатели документа:
Kirensky Institute of Physics, Akademgorodok 50, bld.38, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
}
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16.

Polukeev, S. I.
Dependence of superexchange interaction in CrO2 on pressure / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. H.P19. - P. 103. - Cited References: 3. - Support by RSF grant 18-12-00022 is acknowledged . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Полукеев, Семен Игоревич; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
Нет сведений об экземплярах (Источник в БД не найден)
}
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17.

Polukeev, S. I.
Dependence of superexchange interaction in CrO2 on pressure / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Международная зимняя школа физиков-теоретиков "Коуровка-XXXVIII" : тезисы докладов : Верхняя Сысерть, 23 - 29 февр. 2020 г. - Екатеринбург, 2020. - P. 70. - Cited References: 3. - Support by RSF grant № 18-12-00022 is acknowledged . - ISBN 978-5-9500855-9-8

Материалы конференции,

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Институт электрофизики УрО РАН; Международная зимняя школа физиков-теоретиков "Коуровка"(38 ; 2020 ; 23-29 февраля ; Верхняя Сысерть, Свердловская обл.); "Коуровка", международная зимняя школа физиков-теоретиков(38 ; 2020 ; февр. ; Верхняя Сысерть, Свердловская обл.)
}
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18.

Investigation of microstructural features, phase composition, and magnetic characteristics of YBCO-based composites and additives of CuO non-superconducting component prepared in low-pressure arc discharge plasma / I. V. Karpov, A. V. Ushakov, A. A. Lepeshev [et al.] // Inorg. Mater.: Appl. Res. - 2021. - Vol. 12, Is. 1. - P. 142-146, DOI 10.1134/S2075113321010172. - Cited References: 12. - This work was supported by the Russian Science Foundation (project no. 16-19-10054) . - ISSN 2075-1133
Кл.слова (ненормированные):
low-pressure arc discharge plasma -- CuO nanopowder -- pinning centers -- high-temperature superconductor
Аннотация: A method making it possible to form HTS ceramics of non-superconducting coating consisting of self-organizing CuO crystals, whose sizes are less than the coherence length, i.e., within several tens of nanometers, has been developed. It has been shown that the combination of self-organizing structures in the form of whiskers and nanoparticles which arise as a result of combined sintering of YBa2Cu3O(7–x) powders and electric arc CuO nanopowders results in a significant increase in the current density and appearance of peak effect at high magnetic fields. Very high current density arises from the complex vortex pinning, where whisker defects provide high pinning energy and nanoparticles suppress flux creep. The morphology of such structures can be controlled by a simple change in the concentration of nanodisperse additives. It has been shown that 20 wt % of CuO additive is optimal.

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Публикация на русском языке Исследование микроструктурных особенностей, фазового состава и магнитных свойств композитов на основе YBCO и добавок несверхпроводящего компонента СuО, полученного в плазме дугового разряда низкого давления [Текст] / И. В. Карпов, А. В. Ушаков, А. А. Лепешев [и др.] // Материаловедение. - 2020. - № 6. - С. 27-32

Держатели документа:
Federal Research Center, Krasnoyarsk Research Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Subdivision of Federal Research Center, Krasnoyarsk Research Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Karpov, I. V.; Ushakov, A. V.; Lepeshev, A. A.; Demin, V. G.; Fedorov, L. Y.; Goncharova, E. A.; Zeer, G. M.; Zharkov, S. M.; Жарков, Сергей Михайлович; Akbaryan, A. K.
}
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19.

Shinkorenko, A. S.
Magnetic, electronic, and optical properties of the tetraborates NiB4O7 and CoB4O7 in three structural modifications / A. S. Shinkorenko, V. I. Zinenko, M. S. Pavlovskii // Phys. Solid State. - 2021. - Vol. 63, Is. 3. - P. 468-476, DOI 10.1134/S1063783421030173. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research, project no. 18-32-00919 mol_a . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
ab initio calculation -- behavior under pressure -- phase diagram -- dielectrics -- band structure -- magnetic properties
Аннотация: The physical properties of the NiB4O7 and CoB4O7 tetraborate compounds in three structural modifications with the sp. gr. Pbca, Cmcm, and P6522 have been calculated using the density functional theory in the VASP software package. The pressure dependences of the enthalpy of the compounds in the investigated structural modifications have been calculated. The calculated electron densities of states and band structures showed that the compounds under study in all the considered modifications are dielectrics with a band gap of 3–4 eV. The calculation of the magnetic exchange constants in the Heisenberg model have shown qualitative agreement with the experiment.

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Публикация на русском языке Шинкоренко, Алексей Сергеевич. Магнитные, электронные и оптические свойства тетраборатов NiB4O7 и CoB4O7 в трех структурных модификациях [Текст] / А. С. Шинкоренко, В. И. Зиненко, М. С. Павловский // Физ. тверд. тела. - 2021. - Т. 63 Вып. 3. - С. 376-384

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Шинкоренко, Алексей Сергеевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-32-00919 mol_a]
}
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20.

Magnetic states of Fe2+ ions in FexMn1–xS induced by chemical pressure / G. M. Abramova, Y. V. Knyazev, O. A. Bayukov, S. P. Kubrin // Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P. 68-74, DOI 10.1134/S1063783421010029. - Cited References: 25. - The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (state contract in the sphere of scientific activities, Southern Federal University, 2020) . - ISSN 1063-7834
Кл.слова (ненормированные):
monosulfides of 3d elements -- strongly correlated compounds -- Mossbauer studies -- Fe2+ ion state
Аннотация: Influence of the chemical pressure (x) in single crystals of FexMn1 – xS (0.12 ≤ x ≤ 0.29) on the spin state of iron ions was studied by Mössbauer spectroscopy in the temperature range from 4.2 to 300 K. Peculiarities of formation of the paramagnetic and antiferromagnetic phases of solid solutions were found. Substitution of Fe2+ cations in the high-spin state for Mn2+ was found to occur in FexMn1 – xS as x changes. A decrease in the distance between the ions in FexMn1 – xS induces changes in the state of the Fe2+ ions in the samples with x = 0.25 and 0.29. The asymmetry parameter of the electric field gradient (EFG) tensor and the angle between the directions of the magnetic moment and the principal axis of the electric field gradient were found to change in the magnetically ordered phase at 4.2 K; the angle between the magnetic moment and the electric field gradient axis changes from 21° in the sample with x = 0.12 to 33° when x = 0.29.

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Публикация на русском языке Магнитные состояния ионов Fe2+ в FexMn1-xS, индуцированные химическим давлением [Текст] / Г. М. Абрамова, Ю. В. Князев, О. А. Баюков, С. П. Кубрин // Физ. тверд. тела. - 2021. - Т. 63 Вып. 1.- Ст.69-75

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Research Institute of Physics, Southern Federal University, Rostov-on-Don, 344090, Russian Federation

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Kubrin, S. P.
}
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