Abstract

The dielectric permittivity and domain structures have been measured as a function of temperature in relaxor ferroelectric single crystals (PbMg/sub 1/3/Nb/sub 2/3/O/sub 3/)/sub 1-x/(PbTiO/sub 3/)/sub x/ (PMN-xPT) for x=0.31 and 0.34. Both PMN-31%PT and PMN-34%PT crystals show complex dielectric and domain configurations with coexistence of trigonal and tetragonal symmetries in a wide temperature region. In addition, both crystals exhibit another narrower coexistence of tetragonal and cubic symmetries in the higher temperature region. It was found that different individual regions of the same phase have different transition temperatures. This phenomenon suggests an inhomogeneous distribution of Ti/sup +4/ concentration in the crystals.

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