Abstract
External field effect on the anisotropy of dielectric permeability of KH_{2}PO_{4} and NaKC_{4}H_{4}O_{6}· 4H_{2}O crystals under high pressure
Highlights
Long time has passed since the discovery of ferroelectric activity in KH2PO4 (KDP) and NaKC4H4O6 · 4H2O (Rochelle salt) crystals
This is due to the fact that by applying external pressure once can continuously vary geometrical parameters of hydrogen bonds and violate their equivalence, which provides a unique possibility to study the role of hydrogen bonds in the mechanisms of structural phase transformations and dielectric response of crystals
Based on the experimental studies performed, we discuss the regularities of variation of anisotropy of dielectric permeability of KH2PO4 and NaKC4H4O6·4H2O crystals due to temperature, pressure, and electric field
Summary
Long time has passed since the discovery of ferroelectric activity in KH2PO4 (KDP) and NaKC4H4O6 · 4H2O (Rochelle salt) crystals These materials still attract keen attention of researchers due to their specific physical properties related to a system of structural hydrogen bonds and their changes at phase transformations. Experimental studies of the anisotropy of physical properties and its variation under external pressure and electric field play an important role in understanding the microscopic mechanisms of phase transitions in ferroelectric crystals with hydrogen bonds. Stasyuk and Levitskii [3,4,5] have taken into account the piezoelectric interaction within the framework of a modified Mitsui model for theoretical description of experimental data for Rochelle salt The results of these theoretical studies required experimental investigations of a number of key issues which led to more active experimental studies. These results were obtained in a series of studies starting from 1999, having been initiated by the above mentioned theoretical papers
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