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Общее количество найденных документов : 170
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Zamkova N. G.
Заглавие : Ab initio calculation of the ferroelectric phase transition in disordered and ordered PbSc0.5Ta0.5O3 and PbSc0.5Nd0.5O3 solid solutions with the use of a model Hamiltonian
Разночтения заглавия :авие SCOPUS: Ab initio calculation of the ferroelectric phase transition in disordered and ordered PbSc0.5Ta0.5O3 and PbSc 0.5Nd0.5O3 solid solutions with the use of a model Hamiltonian
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 3. - P542-549. - ISSN 1063-7761, DOI 10.1134/S1063776108030138
Примечания : Cited References: 17
Предметные рубрики: RELAXOR FERROELECTRICS
PEROVSKITES
BATIO3
PBTIO3
Ключевые слова (''Своб.индексиров.''): approximation theory--ferroelectric materials--hamiltonians--mathematical models--monte carlo methods--phase transitions--ferroelectric phase transition--gordon-kim model--local-mode approximation--solid solutions
Аннотация: To describe the ferroelectric phase transition in ordered and disordered PbSc0.5Ta0.5O3 (PST) and PbSc0.5Nd0.5O3 (PSN) solid solutions, a model Hamiltonian is written in the local-mode approximation, in which long-range dipole-dipole and short-range interactions of local modes are taken into account. The Hamiltonian parameters are determined from the set of energies of a series of distorted structures, calculated within the nonempirical generalized Gordon-Kim model. The statistical mechanics of the systems with a model Hamiltonian is investigated by the Monte Carlo method. It is revealed that PSN solid solutions undergo a transition to the ferroelectric rhombohedral phase through an intermediate phase, existing in a narrow temperature range. PST solid solutions undergo a ferroelectric phase transition directly from the paraelectric cubic to the ferroelectric rhombohedral phase.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zinenko V. I.
Заглавие : Ab initio investigation of the magnetic and ferroelectric properties of double perovskites LaPbMeSbO6 (Me = Mn, Fe, Co, Ni)
Коллективы : Russian Foundation for Basic Research [12-02-00025-a], Russian Federation [NSh-924-2014.2]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 5. - P.983-991. - ISSN 1063, DOI 10.1134/S1063783415050340. - ISSN 10906460(eISSN)
Примечания : Cited References:19. - This study was supported by the Russian Foundation for Basic Research (project no. 12-02-00025-a) and the Council on Grants from the President of the Russian Federation in Support of the Leading Scientific Schools (grant no. NSh-924-2014.2). Calculations were performed on supercomputers of the National Research Centre "Kurchatov Institute" (Moscow, Russia).
Аннотация: The results of ab initio calculations of the ferroelectric and magnetic properties of the recently synthesized double perovskites LaPbMeSbO6 (Me (2+) = Mn2+, Fe2+, Co2+, Ni2+) have been presented. The ordered double perovskites with a layered ordering of cations A and A' and a checkerboard ordering of cations B and B' have been considered. The calculation of the lattice dynamics has revealed instabilities in the phonon spectra of the high-symmetry phase of these compounds. The condensation of unstable modes leads to a stable polar phase P2(1). The spontaneous polarization in this phase is found to be 30 mu C/cm(2). The magnetic ground state is antiferromagnetic with an antiparallel direction of the magnetic moments in adjacent planes along the [001] direction. The N,el temperatures are estimated in the mean field approximation. The presence of the ferroelectric and magnetic order parameters in the structure suggests that the studied double perovskites with the simultaneous ordering of the cations are potential multiferroics.
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3.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ershov A. A., Oreshonkov A. S., Shestakov N. P., Aleksandrovsky A. S., Vtyurin A. N.
Заглавие : Absorption spectra of PrF3 crystal
Коллективы : Russia-China workshop on dielectric and ferroelectric materials, Российская академия наук, Воронежский государственный технический университет
Место публикации : The Second Rus.-China Workshop on Dielectic and Ferroel. Mater.: program. - 2015. - Ст.P6.3. - P.82: abstract book
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Anisotropy of dipole-dipole interactions in ferroelectric langmuir films of poly(vinylidene fluoride-trifluoroethylene)
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 10. - P.590-593. - ISSN 0021-3640, DOI 10.1134/S0021364014100026. - ISSN 1090-6487
Примечания : Cited References: 12
Предметные рубрики: LOCAL-FIELD
BLODGETT-FILMS
COPOLYMER
Аннотация: The Lorentz tensor components L (j) for poly(vinylidene fluoride-trifluoroethylene, 70/30) Langmuir-Blodgett films in the ferroelectric phase are determined experimentally. The results indicate that intralayer dipole-dipole interaction between the segments of the polymer is stronger than interlayer interaction. This conclusion agrees with the absence of the critical film thickness below which ferroelectricity would cease to exist.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Molokeev M. S., Kartashev A. V., Flerov I. N.
Заглавие : Anisotropy of piezocaloric effect at ferroelectric phase transitions in ammonium hydrogen sulphate
Место публикации : J. Alloys Compd. - 2020. - Vol. 839. - Ст.155085. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2020.155085
Примечания : 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"
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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6.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Molokeev M. S., Kartashev A. V., Flerov I. N.
Заглавие : Anisotropy of piezocaloric effect at ferroelectric phase transitions in ammonium hydrogen sulphate
Коллективы : Fall Meeting, European Materials Research Society, European Materials Research Society, Warsaw University of Technology
Место публикации : E-MRS fall meeting: conference programme. - 2019. - Ст.E.P.4
Примечания : This work was supported by the Russian Science Foundation (RSF) grant (No. 19-72-00023)
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gridnev S. A., Safonova L. P., Ivanov O. N., Davydova T. N.
Заглавие : Anomalous behavior of the elastic and inelastic properties in the ferroelectric phase of single-crystal (NH4)(2)SO4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 12. - P1998-2001. - ISSN 1063-7834, DOI 10.1134/1.1130702
Примечания : Cited References: 8
Аннотация: The anomalous changes of the low-frequency elastic and inelastic properties of single-crystal (NH4)(2)SO4 accompanying the phase transition from the paraelectric to the ferroelectric phase have been studied by the reverse torsion-pendulum method at 223 K and in the temperature region where the spontaneous polarization changes sign. (C) 1998 American Institute of Physics. [S1063-7834(98)01412-9].
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I.N., Gorev M.V.
Заглавие : Barocaloric and piezocaloric effects in some ferroelectric and fer- roelastic oxyfluorides
Коллективы : European Meeting on Ferroelectricity
Место публикации : 12th European Meeting on Ferroelectricity: Abstracts. - 2011. - Ст.9A-20
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zinenko V. I.
Заглавие : Calculations of the lattice dynamics and spontaneous polarization for thin ferroelectric films of disordered solid solutions PbB'(1/2) BaEuro(1/2)(3)O(3) (B' = Sc, Ga, In, Lu; BaEuro(3) = Nb, Ta)
Коллективы : Russian Foundation for Basic Research; President of the Russian Federation [NSh-4137.2006.2]
Место публикации : Phys. Solid State. - 2009. - Vol. 51, Is. 9. - P.1894-1900. - ISSN 1063-7834, DOI 10.1134/S1063783409090212
Примечания : Cited References: 13. - This study was supported by the Russian Foundation for Basic Research 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-4137.2006.2).
Аннотация: The lattice dynamics and spontaneous polarization in thin ferroelectric films of disordered solid solutions PbB'(1/2) BaEuro(1/2)(3) O-3 (B' = Sc, Ga, In, Lu; BaEuro(3) = Nb, Ta) are calculated in terms of the generalized Gordon-Kim model. It is found that all the compounds under investigation contain an unstable polar mode, the frequencies of this mode for all the compounds are close in magnitude, and the eigenvectors of the soft polar mode are different in character for different types of surfaces (PbO and aOE (c) B O-2, where aOE (c) B is the average ion in the virtual crystal approximation). The frequency of the soft polar mode, the dynamic Born charges, and the rf permittivity are calculated as functions of the film thickness. It is demonstrated that, as the film thickness increases, all the above quantities tend to corresponding values for the bulk compound. The spontaneous polarization of the monoclinic phase distorted along the eigenvector of the soft mode is calculated as a function of the film thickness and in individual layers of the film for different types of surfaces.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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