Temperature and Bias Characteristics of Pb(Zr-Ti)O_3 Families Ceramics

概要

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Temperature and bias characteristics of ceramics of Pb(Zr-Ti)O_3 and its families have been measured. Bias dependence can be understood with a schematic model on the reorientations of 180° and 90° domains. Dielectric and elastic anisotropies of the single crystal are expected to be larger in the rhombohedral phase than in the tetragonal one. Temperature dependence under fixed biases have led to a supposition that ε^<11> and s^<11> are more temperature dependent than ε^<33> and s^<33>, respectively. Physical constants of ceramics are not single-valued functions of polarization P^*. This fact will support Marutake's criticism on the thermodynamic treatments of ceramics formerly reported. A trial of dividing P^* into the increment P^*_<180> caused by 180°-reversals and that P^*_<90> by 90°-rotations make it possible to understand behaviors of piezoelectric constants d^*_<31>, g^*_<31> and coupling coefficient k_r^* versus P^*. Constants d^*_<31> and k_r^* do not represent the degree of poling, and g^*_<31> will be recommended as its practical measure.
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1965-11-15