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Dielectric Properties and Phase Transition of 0.5[( 1-x)PbYb 1/2Nb 1/2O 3–xPbTiO 3]–0.5PbZrO 3 Solid Solution

The phase diagram of the 0.5[(1-x)PbYb1/2Nb1/2O3–(x)PbTiO3]–0.5PbZrO3 ceramic system has been determined. A typical relaxor ferroelectric behavior with field dependent hysteresis loops in 0.5PbYb1/2Nb1/2O3–0.5PbZrO3 (x=0) was observed. As the PbTiO3[PT] content increases, however, the relaxor behavior abruptly disappears. The phase at room temperature is a relaxor between x=0 and 0.1, a pseudocubic ferroelectrics (FE) between x=0.1 and 0.4, a rhombohedral FE between x=0.5 and 0.9 and a tetragonal FE between x=0.9 to 1.0. In particular, a morphotropic phase boundary is found to exist between the rhombohedral and tetragonal FE phases in the vicinity of x=0.9.