We report the presence of an intermediate ferroelectric orthorhombic FE o phase in oriented 0.92Pb(Zn 1/3 Nb 2/3 )O 3 -0.08PbTiO 3 single crystals. High field-long time poling was done in order to stabilize the inherent symmetry of the crystal. Pyroelectric and dielectric measurements were conducted on d 001 ¢ , d 011 ¢ and d 111 ¢ oriented crystals. Pyroelectric and dielectric peaks corresponding to a ferroelectric rhombohedral FE r to FE o phase transition was observed for d 111 ¢ oriented piezocrystals at ∼80°C.
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Priya et al. (2002) studied this question.