Effect of Hydrostatic Pressure on the Phase Transitions in Ferroelectric RbHSO₄ and RbDSO₄

Abstract

Effect of hydrostatic pressure on the ferroelectric Curie temperatures of RbHSO₄ and RbDSO₄ was studied by dielectric constant measurements at high pressures. The observed pressure coefficients of the Curie temperature were 12.0±0.1 deg kbar⁻¹ for RbHSO₄ and 12.7±0.2 deg kbar⁻¹ for RbDSO₄. A pressure-induced phase was found for RbHSO₄ above about 7.5 kbar.