Elastic properties of (PbySn1−y
                     )2P2S6 solid solutions

Bilanych, R.; Yevych, R.; Kohutych, A.; Perechinskii, S. I.; Стойка, І. М.; Vysochanskii, Yulian M.

doi:10.2478/s11534-014-0514-3

Cited by 1 publication

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“…Sn 2 P 2 S 6 (SPS) ferroelectrics (FEs) is one of the prospective materials which presents spontaneous polarization determined by anharmonic potentials for the order parameter fluctuations. Intensive experimental and theoretical efforts have been devoted to the study of SPS crystals [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Among the theories, quantum lattice model (QLM) is of special interest for the SPS investigations [17][18][19][20][21][22][23][24][25].…”

Section: Indroductionmentioning

confidence: 99%

Slow and fast relaxation times of quantum lattice model with local multi-well potentials: phenomenological dynamics for Sn2P2S6 ferroelectric crystals

Erdem¹,

Özüm²,

Güçlü³

2022

Condens. Matter Phys.

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As a continuation of the previously published work [Velychko O. V., Stasyuk I. V., Phase Transitions, 2019, 92, 420], a phenomenological framework for the relaxation dynamics of quantum lattice model with multi-well potentials is given in the case of deformed Sn2P2S6 ferroelectric lattice. The framework is based on the combination of statistical equilibrium theory and irreversible thermodynamics. In order to study these dynamics in a connected way we assume that the dipole ordering or polarization (η) and volume deformation (u) can be treated as fluxes and forces in the sense of Onsager theory. From the linear relations between the forces and fluxes, the rate equations are derived and characterized by two relaxation times (τS , τF) which describe the irreversible process near the equilibrium states. The behaviors of τS and τF in the vicinity of ferroelectric phase transitions are studied.

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