XRD Measurement of 90° Domain Reorientation and Domain Contribution to the Electric-Field-Induced Strain in PZT Ceramics

摘要

An in situ X-ray diffraction (XRD) method was used to evaluate the 90° domain reorientation of lead zirconate titanate (PZT) ceramics under the electric field. The strain caused by the reorientation was calculated and compared with the electric-field-induced longitudinal strain measured with a laser displacement meter and the strain expected from the piezoelectric d-constant. It was confirmed that the electric-field-induced strain of PZT ceramics was composed of strains due to the piezoelectric effect and the 90° domain reorientation. In donor-added "soft" PZT ceramics, the amounts of the reorientation caused by poling and by the subsequent application of an electric field had a close correlation with the tetragonality of the crystal lattice. In Mn-doped PZT ceramics, the contribution 90° domain reorientation to the electric-field-induced strain depended on the frequency of electric field and increased under a high field with a low frequency.