The hydrostatic pressure dependence of the phase transitions and dielectric properties for a potassium niobate crystal

The phase transitions, spontaneous polarizations, and dielectric properties of a potassium niobate (KNbO3) ferroelectric crystal were investigated under hydrostatic pressure from 0 to 21.3 GPa using the Landau–Ginsburg–Devonshire phenomenological theory. It was shown that the phase transition temperatures of cubic to tetragonal, tetragonal to orthorhombic, and orthorhombic to rhombohedric decreased as the hydrostatic pressure was increased and...