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Fluctuations in ferroelectrics and dielectric properties from the Fokker‐Planck equation
Author(s) -
Kaupuzs J.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221950135
Subject(s) - ferroelectricity , condensed matter physics , phase transition , dielectric , fokker–planck equation , phase (matter) , physics , dispersion (optics) , transition point , landau theory , statistical physics , materials science , quantum mechanics , thermodynamics , differential equation
The Fokker‐Planck equation is used to study the dielectric susceptibility dispersion in ferroelectrics within the Landau‐Ginzburg model. Subsequent consideration of fluctuations, recently used for calculations in the paraelectric phase, is extended. The results of a more comprehensive study including calculations for both the ferroelectric phase and refined calculations for the ferroelectric phase are presented here. The obtained results allow to explain qualitatively the resonance dispersion close to the critical point, observed in SbSI‐type ferroelectric crystals. Besides, the diffuse phase transition in relaxor ferroelectrics and its spontaneous transfer to the first‐order phase transition is explained within the considered model.