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Anisotropic piezoelectricity has been intensively investigated in PbZrO 3 ‐ or PbTiO 3 ‐based perovskite ceramics, in comparison with the isotropic characteristic in the intermediate composition of the solid‐solution Pb(Zr, Ti)O 3 system. In order to explain the piezoelectric anisotropy, a phenomenological treatment is proposed for a perovskite sublattice system, including electromechanical coupling terms. Electrostrictive couplings, especially between the two sublattices, provide significant contribution to the piezoelectric anisotropy.
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Uchino et al. (1991) studied this question.
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