Библиографическое описание:Structure, thermal properties and phase transition in RbCdHfF7: experiments and lattice dynamics calculations : научное издание / Evgeniy V. Bogdanov [et al.]. - Текст : непосредственный // Solid State Sciences. - 2025. - Т. 168, № . - P. 108042. - ISSN 1293-2558. - ISSN 1873-3085, DOI 10.1016/j.solidstatesciences.2025.108042.
Аннотация:A mixed-cation fluoride RbCdHfF7 was synthesized. The room temperature structure was determined as orthorhombic (Cmcm, Z = 4). Comprehensive studies of thermal properties and permittivity revealed a phase transition of a non-ferroelectric nature at T0 = 207 K. Calculations using the density functional theory, as well as the behavior of the order parameter Ω(T), indicate a doubling of the unit cell volume in the low-temperature phase, which is associated with an unstable mode at the S boundary point of the Brillouin zone. The monoclinic symmetry (P21/c, Z = 4) was chosen for phase below T0. Very high sensitivity to hydrostatic pressure and low entropy of structural transformation were found and discussed.
Издательство:Elsevier Science Publishing Company, Inc.
Источник:Solid State Sciences
Выпуск:Т. 168
Номера страниц:108042
Держатель оригинала документа:Institute of Chemistry, Far Eastern Department of RAS, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk State Agrarian University, Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Siberian Federal University
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