A phase analysis in pseudobinary (1minus;x)Pb(F1/2Nb1/2)O3minus;xPb(Mg1/2W1/2)O3system is conducted by measuring its dielectric properties,Ehyphen;Physteresis, and dc resistivity atx= 0.1 interval. Lattice parameters and ordering of ions are analyzed by the xhyphen;ray diffraction method, and the temperaturehyphen;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 ferroelectrichyphen;paraelectric for the composition range of 0.0les;xles;0.5 to antiferroelectrichyphen;paraelectric for the composition range of 0.6les;xles;1.0. The ferroelectrichyphen;paraelectric transition is relativity sharp for 0.0les;xles;0.1 and becomes diffuse for 0.2les;xles;0.5, and the antiferroelectrichyphen;paraelectric is diffuse for 0.6les;xles;0.8 and becomes sharp for 0.9les;xles;1.0.
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