Abstract
Abstract Complex material parameters (piezoelectric coefficient d31, elastic s11 E, and the dielectric constant K33) of the relaxor ferroelectric ceramic (1−x) Pb(Mg1/3Nb2/3)O3-xPbTiO3(x =.07) with 1% La (lanthanum) were measured as a function of bias field using a bar resonator. The values of the dielectric and piezoelectric phase angles are found to be comparable (i.e., around 0.04 for a d.c. bias field of 2.5 kV/cm), while the elastic phase angle is an order of magnitude smaller (0.001 for the same d.c. bias). For comparison of complex material parameters found from bar resonators, a sample in the form of a small disk is used to measure Poisson's ratio as well as the real components of the piezoelectric and elastic coefficients as a function of bias field.
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