Investigation of domain behaviour in 0.7Pb(Mg1/3Nb2/3) O3-0.3PbTiO3 single crystals at different temperatures in the transmission electron microscope |
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Authors: | X. Meng K. Z. Baba-Kishi G. K. H. Pang H. L. Chan C. L. Choy H. S. Luo |
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Affiliation: | 1. Department of Applied Physics , The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, PR China;2. Shanghai Institute of Ceramics , Chinese Academy of Sciences , 215 Cheng Bei Road, Shanghai, 2010800, PR China |
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Abstract: | Using transmission electron microscopy, in-situ changes in ferroelastic domains in 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 single crystals were observed at 60 to -163°C. At -163°C, the microscopic tweed morphology of the ferroelastic domains rotated by 90°, and certain orientation changes in the mesoscopic sawtooth domains took place. At this temperature, the ferroelastic domains became coarsened and certain S-shaped mesoscopic domains were reshaped. The disappearance and/or changes in the orientations of both the sawtooth and the ferroelastic domains were reversible upon return to room temperature. On heating to 60°C, both the mesoscopic sawtooth and the microscopic tweed domains were stable below 53°C. Above 53°C, the mesoscopic walls disappeared and the contrast of the tweed domains became blurred. Upon return to room temperature from 60°C, the mesoscopic domain patterns could not be retrieved, indicating that the transformation was irreversible. The morphology of the tweeds at this temperature indicated a structural transition from a two-variant domain state to a multivariant state, eliminating mesoscopic boundaries. |
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