Antiferroelectric phase transition in Pb(Mg1/2X1/2)O3(X=Mo and W)

Polycrystalline samples of Pb(Mg1/2X1/2)O3 (X=Mo and W) were synthesized by a high-temperature solid-state reaction technique. Preliminary structural (X-ray diffraction) study of the compounds shows the formation of a single phase compound. Microstructural study of the compounds shows a uniform distribution of nearly spherical grains throughout the surface of the sample. Detailed studies of relative dielectric permittivity (εr) and loss tangent (tan δ) of the compounds both as a function of frequency (102–104 Hz) at room temperature (30 °C) and temperature (30–320 °C) at 10 kHz suggest that the compounds have antiferroelectric phase transition. The activation energy of the Mo and W containing compound was found to be 0.61 and 0.72 eV, respectively.