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Zhandun, V. S.
Lattice dynamics and the ferroelectric phase transition in ordered Pb-2 B'BaEuro(3)O(6) (B' = Ga, In, Lu; BaEuro(3) = Nb, Ta) solid solutions / V. S. Zhandun, N. G. Zamkova, V. I. Zinenko // Phys. Solid State. - 2010. - Vol. 52, Is. 2. - P. 357-363, DOI 10.1134/S1063783410020228. - Cited References: 19. - This study is supported by the Russian Foundation for Basic Research (project no. 09-02-00067) and the Council on Grants from the President of the Russian Federation for Support of the Leading Scientific Schools (grant no. NSh-4137.2006.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITES
   CRYSTALS
   DISORDER
   RELAXOR
   BATIO3
   PBTIO3
Аннотация: The lattice vibration spectrum, rf permittivity, and dynamic Born charges have been calculated for ordered Pb-2 B'BaEuro(3)O(3) (B'=Ga, In, Lu; BaEuro(3)=Nb, Ta) solid solutions in terms of the generalized Gordon-Kim model. It has been shown that all compounds exhibit a ferroelectric instability and that the frequencies of "soft" ferroelectric modes are close in magnitude. The ferroelectric phase-transition temperatures and the spontaneous polarization in the ferroelectric phase of the solid solutions under consideration have been calculated by the Monte Carlo method using the model Hamiltonian in the local mode approximation. The transition temperature is found to increase with increasing atomic number of the B' ion.

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Держатели документа:
[Zhandun, V. S.
Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Жандун, Вячеслав Сергеевич
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Zhandun, V. S.
Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions / V. S. Zhandun, N. G. Zamkova, V. I. Zinenko // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 6. - P. 1109-1117, DOI 10.1134/S1063776108060101. - Cited References: 29 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
STATISTICAL-MECHANICS
   PEROVSKITES
   CRYSTALS
   ORDER
   RELAXOR
   BATIO3
   PBTIO3
Кл.слова (ненормированные):
Crystal lattices -- Ferroelectricity -- Lattice vibrations -- Solids -- Ferroelectric (barium strontium titanate) -- Ferroelectric phase transitions -- Lattice (CO) -- Lattice dynamics -- Vibration spectrum -- Ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.

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Держатели документа:
[Zhandun, V. S.
Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Жандун, Вячеслав Сергеевич
}
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Zinenko, V. I.
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 / V. I. Zinenko, N. G. Zamkova // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 3. - P. 542-549, DOI 10.1134/S1063776108030138. - Cited References: 17 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
RELAXOR FERROELECTRICS
   PEROVSKITES
   BATIO3
   PBTIO3
Кл.слова (ненормированные):
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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Держатели документа:
[Zinenko, V. I.
Zamkova, N. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Зиненко, Виктор Иванович
}
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Zinenko, V. I.
Lattice dynamics of MF3 crystals (M = Al, Ga, and In) / V. I. Zinenko, N. G. Zamkova // Phys. Solid State. - 2000. - Vol. 42, Is. 7. - P. 1348-1353, DOI 10.1134/1.1131391. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
RAMAN-SCATTERING
   FERROELECTRICITY
   BATIO3
   PBTIO3
Аннотация: The phonon spectra, Born effective charges, and dielectric constants epsilon(infinity) for the square AlF3, square GaF3, and square InF3 crystals (where is a vacancy) have been calculated in terms of the generalized Gordon-Kim method. The calculated spectra of lattice vibrations contain no imaginary vibrational frequencies. This suggests the stability of the cubic phase of these compounds but contradicts the observable structural transition from cubic to rhombohedral phase. It is assumed that such a transition in the square AlF3, square GaF3, and square InF3 crystals is brought about by structural defects. The calculated spectrum of lattice vibrations of the "completely defective" crystal M square F-3 (M = Al, Ga, and In) indicates a strong instability of the cubic phase. Within the mean crystal approximation, the cubic phase of M-x M1 - xF3 crystals appears to be unstable at small x less than or equal to 0.05. (C) 2000 MAIK "Nauka/Interperiodica".

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

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Зиненко, Виктор Иванович
}
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Effect of Sequential Heat Impacts on the Formation of a Stable State of the xLPM-(1-x)PT Multiferroic Composites / E. A. Mikhaleva [et al.] // Phys. Solid State. - 2018. - Vol. 60, Is. 12. - P. 2524-2531, DOI 10.1134/S1063783419010189. - Cited References: 15. - 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 the Scientific and R&D Activity, project no. 17-42-240076 "Complex Approach to Searching and Development of Promising Solid-State Ferroic Cooling Agents Based on the Single- and Multicaloric Effects." . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
PbTiO3
Аннотация: The effect of thermal cycling and sintering temperature on the chemical and thermodynamic stability of the bulk multiferroic xLa0.7Pb0.3MnO3–(1 – x)PbTiO3 quasi-ceramic and ceramic composites has been experimentally investigated. It is shown that the limiting temperature of the long-term sample firing should not exceed 1070 K. It has been found that sintering at this temperature and/or short-term exposure of the samples at higher temperatures (up to 1220 K) significantly increase the sample compactness, stabilize the thermal expansion, and enhance the quality of the composites. It has been established that the component grain integrity is violated by shrinkage of the samples and a sharp change in their volume during the phase transition of a ferroelectric component.

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Публикация на русском языке Влияние последовательных термических воздействий на формирование стабильного состояния мультиферроидных композитов xLPM-(1-x)PT [Текст] / Е. А. Михалева [и др.] // Физ. тверд. тела. - 2019. - Т. 61 Вып. 1. - С. 87-94

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Russian Foundation for Basic Research [17-42-240076]; Government of the Krasnoyarsk Territory [17-42-240076]; Krasnoyarsk Territorial Foundation [17-42-240076]
}
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