The pyroelectric coefficient (at constant stress) of a 95 wt% BaTiO 3, 5 wt% CaTiO3 ceramic composition (Clevite Ceramic B) was measured over the temperature range from 4.9°to 400°K. Extrema in the pyroelectric coefficient were observed at the rhombohedral-orthorhombic transition point (150°-170°K), the orthorhombic-tetragonal transition point (240°-260°K), and the tetragonal-cubic transition point (Curie point, at 387°K). The pyroelectric coefficient showed no anomalous behavior below 150°K. A spontaneous polarization curve derived from the pyroelectric results is compared with published single-crystal measurements. The ceramic results can be completely interpreted by means of a model describing switching of domain orientations at phase transitions.
ASJC Scopus subject areas
- Physics and Astronomy (all)