Modeling dielectric dispersion by the relaxation method

The RTD corresponding to multiple-arc approach has been employed to investigate the effect of sintering temperature on the characteristics of metal-oxide varistor (MOV) dielectrics. The analysis has revealed the probable existence of phase transition in MOV near 700/spl deg/C temperature. The separated polarization corresponding to ZnO grains and additive oxide diminishes at higher temperature, and merges into one category of polarization presumably dominated by the additive oxide modified by the shunting effect of ZnO grains.