Shift of Curie Temperature of Barium Titanate Due to Two-Dimensional Pressure

Abstract

Shift of the Curie temperature of barium titanate due to a two-dimensional pressure perpendicular to the ferroelectric axis was studied. The observed rate of shift of the Curie point is 13.8±1.5°C/kbar. This result is in reasonable agreement with the predictions of the Clausius-Clapeyron equation and the phenomenological theory of ferroelectrics. Measurements with and without dc bias voltage applied to the crystal have shown that domain structure, which exists in zero bias, causes an erroneous result.