Theory on the Effect of Hydrostatic Pressure on the Permittivity and Curie Point of Single Crystal Barium Titanate

抄録

The effect of hydrostatic pressure on the permittivity and Curie point of single crystal of barium titanate has been investigated from phenomenological thermodynamic theory. In all previous studies, such correlation has been made in the para-electric state where the reciprocal permittivity is linear with temperature. In contrast, the present paper predicts the variation of permittivity of the material with pressure both in the para-electric and in the ferroelectric state. The change in Curie point under hydrostatic pressure has also been computed. The predicted variation of both the permittivity and the Curie point with pressure are compared with the earlier experimental data and are in reasonably good agreement.