Piezoceramic materials with very large anisotropy of piezoelectric coefficients: physical aspects of the problem

This work contains a review of the authors' up-to-date papers devoted to the topical problem of the large anisotropy of the piezoelectric coefficients d*/sub 33//d*/sub 31/ materials. The principal physical factors responsible for this effect in PbTiO/sub 3/ -based materials have been analysed.