Rhombohedral-to-tetragonal phase transformation and thermal depolarization in relaxor-based ferroelectric single crystal

Chang, W. S.; Lim, L. C.; Yang, P.; Tu, C. -S.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p082903
Academic Journal
The rhombohedral-to-tetragonal (R-T) transformation in relaxor single crystals occurs over a temperature range, manifested by the coexistence of rhombohedral (R) and tetragonal (T) microscopic and nanotwin domains, a string of thermal current signals, and continued degradation of dielectric and electromechanical properties. Thermal current and high-resolution x-ray diffraction results suggest TRT≅100–135 °C for [001]-poled PZN-4.5%PT and 90–115 °C for [001]-poled PZN-7%PT. The “TRT” determined from the dielectric permittivity-temperature plot of poled crystals corresponds to the lower bound of TRT, which is also a good indication of the depolarization temperature (TDP) of relaxor ferroelectric single crystals above which perceptible property degradation begins.


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