On the difference between dielectric and piezoelectric relaxation

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Abstract
Dielectric and piezoelectric relaxations are treated in the same way by the two-site model in order to clarify the difference. The molecular mechanism for these phenomena is assumed to be the reorientation of molecules having permanent dipole moments. It is suggested that the instantaneous response (polarization) to the stimulus is essentially important in the piezoelectric case. The frequency and temperature dependence is discussed for a polymer film. It is shown that many characteristic features of the relaxation phenomena can be well explained qualitatively by this simple model if one assumes an appropriate potential change for the dipole caused by the application (or removal) of the external electric field or strain