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Abstract
The effective macroscopic symmetry of the PZN-PT single crystal systems is a key issue for the characterization of domain engineered single crystals. We report an optical microscopy study on the domain structures of 0.955Pb(Zn⅓Mb⅔)O3-0.045PbTiO3(PZN-PT) rhombohedral phase single crystals poled along [001] of the cubic coordinates. Both charged and uncharged domain walls are observed in domain engineered samples and they could join together to form “L” and “T” shaped domain walls. The observed domains are between 10–100 μm in size, which are too big for statistical treatment. Most of the poled samples have only two of the four possible degenerate domain states, making the macroscopic symmetry to be either orthorhombic mm2 or monoclinic m, or even triclinic 1 rather than tetragonal 4 mm previously assumed. Physical property measurements also support the conclusion or lower symmetry.