Phase transitions in the Pb(In_(1/2)Nb_(1/2))O_3-PbZrO_3 system

摘要

Phase transitions and dielectric properties of (1-x)Pb(In_(1/2)Nb_(1/2))O_3(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 ε′_r showed a sharp peak at T_c. In this regime, the phase below T_c was confirmed to be ferroelectric by observation square P-E hysteresis loops. For x > 0.8, a steplike dielectric anomaly appeared at T_t (below T_c) as well as the sharp peak in the permittivity. The phase below T_t 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.