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The microstructure and phase transition in relaxor ferroelectricPb(Mg1/3Nb2/3)O3 (PMN) and its solid solution with PbTiO3 (PT), PMN-xPT, remainto be one of the most puzzling issues of solid state science. In the presentwork we have investigated the evolution of the phase symmetry in PMN-xPTceramics as a function of temperature (20 K < T < 500 K) and composition (0 <=x <= 0.15) by means of high-resolution synchrotron x-ray diffraction.Structural analysis based on the experimental data reveals that thesubstitution of Ti^4+ for the complex B-site (Mg1/3Nb2/3)^4+ ions results inthe development of a clean rhombohedral phase at a PT-concentration as low as5%. The results provide some new insight into the development of theferroelectric order in PMN-PT, which has been discussed in light of thekinetics of polar nanoregions and the physical models of the relaxorferroelectrics to illustrate the structural evolution from a relaxor to aferroelectric state.Comment: Revised version with updated references; 9 pages, 4 figures embedde

physical review. b, condensed matter

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Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3