New data of 90° domain reorientation on Ca-modified lead titanate ceramics obtained from XRD and thermal expansion measurements are reported. Results confirm that microstructure and poling treatment that favor a relatively high percentage of 90° domains reoriented (N(90°) = 10.9%) are needed to have ceramics with zero planar coupling factor (KP = 0).
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Pardo et al. (1989) studied this question.
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