Lanthanum modified lead titanate, (Pb0·775La0·15)TiO3 ceramics with a tetragonality of c/a = 1·024 were hot-pressed and the anisotropy of internal stress generated by applying a poling field were measured using a microindentation technique. In this specimen with a grain size of Gs=3·0 μm, the internal stresses in the directions perpendicular and parallel to the DC poling field were 151 and 35 MN/m2, respectively. The results are explained by the crack-extentional and compressive forces, respectively.
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Yamamoto et al. (1983) studied this question.
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