A phase analysis in pseudobinary Pb(Fe1/2Nb1/2)O3−Pb(Mg1/2W1/2)O3 solid solution

Abstract

A phase analysis in pseudobinary (1−x)Pb(F1/2Nb1/2)O3−xPb(Mg1/2W1/2)O3 system is conducted by measuring its dielectric properties, E-P hysteresis, and dc resistivity at x = 0.1 interval. Lattice parameters and ordering of ions are analyzed by the x-ray diffraction method, and the temperature-composition phase diagram is determined. The system is found to form a solid solution of perovskite structure throughout the entire composition range, but the nature of its phase transitions changes from ferroelectric-paraelectric for the composition range of 0.0⩽x⩽0.5 to antiferroelectric-paraelectric for the composition range of 0.6⩽x⩽1.0. The ferroelectric-paraelectric transition is relativity sharp for 0.0⩽x⩽0.1 and becomes diffuse for 0.2⩽x⩽0.5, and the antiferroelectric-paraelectric is diffuse for 0.6⩽x⩽0.8 and becomes sharp for 0.9⩽x⩽1.0.