Phase transformation in unpoled bulk Pb (Zn13 Nb23) O3 -8%PbTi O3 single crystals revealed by the fracturing technique
Chang, W.S. Lim, L.C. Wang, F.-T. Tu, C.-S. Yang, P.
Wang, F.-T.
Tu, C.-S.
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Abstract
Polished-and-annealed surfaces of bulk Pb (Zn13 Nb23) O3 -PbTi O3 (PZN-PT) single crystals were covered with a deformed layer and, hence, were unsuitable for structural study by means of x-ray diffraction technique. In contrast, fractured surfaces of bulk single crystals were relatively strain-free giving rise to distinctive diffraction patterns. Using the fracturing technique and high-resolution synchrotron x-ray diffraction, the present work shows that unpoled (annealed) PZN-8%PT single crystal undergoes a (MC) -T-C transformation upon heating under zero field condition, where T and C are the tetragonal and cubic phases, respectively. The symbol (MC) indicates an "apparent" type- C monoclinic phase, which in fact may be a rhombohedral phase of complicated domain structures. © 2008 American Institute of Physics.
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Journal of Applied Physics
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Date
2008
DOI
10.1063/1.2903344
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Article