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Abstract
Complex-perovskite ferroelectric relaxors A(Bx′B1-x″)O3 have isotropic appearance in the polar phase, as demonstrated by Pb(Mg1/3Nb2/3)O3 and B-site disordered Pb(Sc1/2Ta1/2)O3 crystals. In Pb(Sc1/2Ta1/2)O3, ordering of the B-site cations causes birefringence and ferroelectric domains to appear. Pb(Sc1/2Nb1/2)O3 shows an intermediate behavior. In the ferroelectric phase all three materials show rhombohedral symmetry. Comparison of the ordered and the disordered Pb(Sc1/2Ta1/2)O3 supports the theory that the optical anomaly in ferroelectric relaxors results from existence of microdomains due to compositional fluctuation.
