ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

4pEA14. Thermodynamic property considerations for modeling piezoelectric ceramic vibrators including thermal effects.

Won-kyu Moon

Ilene J. Busch-Vishniac

Mech. Eng. Dept., Univ. of Texas at Austin, Austin, TX 78712

The thermodynamic characteristics of piezoelectric ceramics are investigated by considering two thermodynamic material property models: isentropically linear and isothermally linear models. Those two models are two possible interpretations of the data on temperature-dependent linear coefficients of piezoelectric ceramics. Thermodynamic differences of the two models are examined and effects of the thermo-electro-mechanical couplings are evaluated in examples. Application of the thermo-electro-mechanical model to PZT4 shows that the difference observed in piezoelectric constants obtained by static and dynamic measurements cannot be explained by the difference between isothermal and isentropic processes.