Paper detail

Pressure dependence of the low-frequency dielectric constant of KNbO_3

The effect of pressure on the low-frequency dielectric constant, $ε_0$, of single crystals of KNbO_3 is investigated by means of capacitance measurements. The dielectric constant increases with pressure up to 22.5 kbar, where it exhibits a large value ($ε_0$ = 5000), and then decreases. This change in its behaviour is related to a phase transition induced by pressure. On decompression, the samples do not revert back to the ambient pressure phase.