Abstract
The method to distinguish two types of monoclinic phases (M A and M B) in perovskite crystals by polarized light microscopy was developed. The M A-type monoclinic phase was observed in xPb(In 1/2Nb 1/2)O 3– yPb(Mg 1/3Nb 2/3)O 3– zPbTiO 3 ternary crystal by polarized light microscopy at room temperature. The phase transition of these monoclinic phases under dc electric field along [1 1 0] cub direction was investigated in real time. Two dielectric peaks were found in ferroelectric phases of the as-grown ternary single crystals near the morphotropic phase boundary (MPB) with increasing temperature, which indicate the phase transition of monoclinic M A → orthorhombic (O) → tetragonal (T).
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