HYDROSTATIC-PRESSURE DEPENDENCE OF DIELECTRIC-PROPERTIES IN LEAD INDIUM NIOBATE-BASED COMPLEX PEROVSKITE SYSTEMS

Dielectric properties of (1 - x)Pb(In1/2Nb1/2)O-3 - xPbZrO(3)(Zr-PIN) and (1 - x)Pb(In1/2Nb1/2) O-3 - xPb(Yb1/2Nb1/2)O-3(Yb-PIN) mixed cryst al systems have been studied under hydrostatic pressures up to 0.7 GPa . In Zr-PIN, the temperature T-m, indicating the maximum of the dielec tric constant, epsilon(rm)', decreases at the rate of dT(m)/dp\(p = 0) = -54 degrees C/GPa for x = 0.1 and -100 for 0.34, while in Yb-PIN th e T-m increases at the rate of dT(m)/dp = 155 degrees C/GPa for x = 0. 16. The epsilon(rm)' decreases with increasing pressure in Zr-PIN and Yb-PIN. There is similarity between effects of pressure and concentrat ion on dielectric properties in these materials.