期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 70, 期 10, 页码 3149-3154出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.70.3149
关键词
relaxor; Raman scattering; diffuse phase transition; mixed crystal; PMN
Single crystals and ceramics of (1 - x)PMN-xPT were synthesized in the whole concentration range from x = 0 to x = 1, and the temperature-concentration phase diagram of the system was determined from the dielectric measurement. The temperature dependences of the Raman spectra in the mixed crystals were measured. Raman active modes were observed even in the high temperature cubic phase above the ferroelectric transition point up to x = 0.8. With the electron diffraction result that the superlattice reflections could not be observed above the morphotropic phase boundary (x = 0.35) [C. A. Randall, A. S. Bhalla, T. R. Shrout and L. E. Cross: J. Mater. Res. 5 (1990) 829], the present result indicates that the Raman active modes in the high temperature phase cannot be explained by the superstructure with the Fm (3) over bar m symmetry due to the zone folding.
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