PHASE-TRANSITIONS IN THE PB(IN1/2NB1/2)O-3-PBZRO3 SYSTEM

Phase transitions and dielectric properties of (1-x)Pb(In1/2Nb1/2)O3(PIN)-xPbZrO 3(PZ) solid solution system have been examined as a function of the concentration x. Two morphotropic phase boundaries were identified: (1) pseudocubic to rhombohedral phase boundary at x=0.35 and (2) rhombohedral to orthorhombic at x=0.8. For x<0.35, a diffuse phase transition was observed. For 0.35<x<0.8, the relative permittivity εr′ showed a sharp peak at Tc. In this regime, the phase below Tc was confirmed to be ferroelectric by observation square P-E hysteresis loops. For x>0.8, a steplike dielectric anomaly appeared at Tt (below Tc) as well as the sharp peak in the permittivity. The phase below Tt was confirmed to be antiferroelectric by the observation of double P-E hysteresis loops. The maximum permittivity of 15 000 (at 100 kHz) was observed at x=0.35 © 1995 American Institute of Physics.