Twinning domain in 67Pb(Mg(1/3)Nb(2/3))O3-33PbTiO3 ferroelectric complex perovskite crystal grown by the Bridgman method

Single crystals of 67Pb(Mg(1/3)Nb(2/3))O3-33PbTiO3 (PMN-PT, PMNT) relaxor-based complex perovskite solid solution grown by the Bridgman method have pseudo-cubic symmetry under ambient conditions. Examination by means of polarized light microscopy showed that the microstructure of the crystals was dominated by a large number of coarse twin domains. It was confirmed that the most common composition planes were 110-plane type; in addition, 112-plane type planes were also observed. These twins may be associated with the transformation of PMNT complex perovskite from the cubic to tetragonal upon a decrease in temperatures. The morphology of the domain structure may be explained on the basis of the theory of martensitic transformation. (Author)