Comparison of Piezoelectric Constants of PZT Ceramics with Values Calculated from Electrostrictive Coefficients

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Abstract
The piezoelectric and elastic behavior of ferroelectric perovskites can be understood by considering parameters such as the permittivities, spontaneous polarization and electrostrictive effect. We recently succeeded in measuring the single-crystal electrostrictive coefficients of Pb0.83Sr0.12Ba0.05 [Zr x Ti0.98-x Nb0.02]O3. From these results and the spontaneous strain measurements together with the temperature dependence and aging of permittivity we were able to calculate the dielectric and piezoelectric single-crystal constants of these ceramics. Averaging these values yielded material constants that deviate from the ceramic constants measured by standard resonance methods. The differences are considered to be due to the domain wall contributions to these material constants.

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