Publication
Solid State Communications
Paper

Polarization in the cubic phase of BaTIO3

View publication

Abstract

We have measured, at three different wave lengths, the temperature dependence of the optic index of refraction, n(T), in ferroelectric BaTiO3 for T > Tc (Tc ≡ the cubic to tetragonal transition temperature). n(T) deviates from the high temperature extrapolated value between Tc and ≈ Tc + 180°C. Assuming that these deviations are caused by the quadratic electro-optic effect, and taking its dispersion into account, we obtain, with no adjustable parameters, a root mean square polarization, | P |, vs. temperature in the cubic phase. At T+c, |P| is about 30% to 50% of the value of the reversible spontaneous polarization at T-c. These results are consistent with the recently published infrared studies of BaTiO3 for T>Tc and two proposals for their origin are discussed. © 1982.

Date

01 Jan 1982

Publication

Solid State Communications

Authors

Topics

Share