Abstract
Modied four-sublattice model for Rochelle salt by taking into account piezoelectric interactions with shear strain "4, "5 and "6 is proposed. Components of polarization vector and static dielectric permittivity tensor for both mechanically clamped and free crystals, their piezoelectric characteristics and elastic modules are derived in the mean eld approximation. A comprehensive study of transverse eld effect on phase transition temperatures, dielectric and elastic properties of Rochelle salt has been performed for the rst time.
Highlights
Rochelle salt (Rs) is a special ferroelectric hydrogen bonded compound
In order to describe the phase transitions in Rochelle salt and its thermodynamic characteristics we use the “three-dimensional” model [36] that takes into account the presence of four translationally non-equivalent groups of atoms in a unit cell, whose positions are related by elements of the paraelectric point group [3,4]
Using expressions (3.15), we find static dielectric susceptibilities of mechanically free crystal of Rochelle salt χσiip(σ5, E2)
Summary
Rochelle salt (Rs) is a special ferroelectric hydrogen bonded compound. Some details of its structure and a precise mechanism of the phase transitions are still unclear. The modified Mitsui model [27] made possible a proper description of longitudinal dielectric, piezoelectric, and elastic characteristics of Rochelle salt and its behavior in the presence of longitudinal electric field and hydrostatic pressure This model oversimplifies the real structure of the crystal, postulating the direction of the ferroelectric axis among the three possible second order axes. Within the framework of the order-disorder scenario, the equilibrium positions of non-equivalent atomic groups are simulated by a four-sublattice pseudospin model that allows one too calculate all components of the tensors of the crystal characteristics, and to explore the effects of transverse (perpendicular to the ferroelectric axis a) electric fields. The effect of the transverse electric field on these characteristics is explored
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