Temperature dependence of the spontaneous polarization in Rochelle salt and thiourea | Zendy

Piekara† A. H. | Zendy; Wiȩckowski A. B. | Zendy

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Temperature dependence of the spontaneous polarization in Rochelle salt and thiourea

Author(s) -

Piekara† A. H.,

Wiȩckowski A. B.

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.2221970133

Subject(s) - thiourea , ferroelectricity , curie temperature , polarization (electrochemistry) , condensed matter physics , materials science , curie , hydrogen bond , thermodynamics , chemistry , physics , molecule , organic chemistry , dielectric , optoelectronics , ferromagnetism

The occurrence of ferroelectric properties characterized by two (and three) Curie temperatures is explained phenomenologically by a model of structural antiferroelectrics with two sublattices, involving hydrogen‐like bonds with asymmetric potential wells. On the assumption of a slight discrepancy between the differences in energy levels Δ U 1 and Δ U 2 of the two sublattices, a non‐zero spontaneous polarization is obtained for certain well‐defined ranges of temperature. The model permits an explanation of the temperature dependence of polarization in Rochelle salt and thiourea.

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