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Abstract
The effect of pressure on the low-frequency dielectric constant (E) of single crystals of KNbO3 is investigated by means of capacitance measurements. Measurements were carried out at pressure up to 35 kbar using a large volume cell. The dielectric constant increases with pressure up to 22.5 kbar, where it exhibits a large value (ϵ > 5000), and then decreases. This change in its behaviour is related to a phase transition induced by pressure. The character of the observed transition is also discussed. In addition, evidence indicating that the phase transition is not reversible has been also observed.