Abstract
The temperature dependence of the remnant dielectric polarization, PR(T), effective birefringence parameter, Δn¯(T), of hot-pressed ferroelectric 8/65/35 lead zirconate-lead titanate-lanthanum oxide (PLZT) has been investigated. The material exhibits relaxor behavior and a diffuse phase transition in the neighborhood of 102 to 109 °C. The PR(T) and Δn¯(T), however, dramatically decrease at temperatures distinctly lower than the diffuse phase transition temperature region. A ferroelectric domain alignment in poled samples, and a thermally influenced disalignment is proposed in order to account for the additional observed behavior. A mechanism based upon grain-boundary heterogeneities is suggested. Differential thermal analysis data are consistent with a domain disalignment scheme.
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