Yttrium Doping Effect on Varistor Properties of Zinc-Vanadium-Based Ceramics

The influence of yttrium doping on varistor properties of zinc-vanadium-based ceramics was comprehensively investigated. The average grain size varied slightly between 5.2 and 5.5 m as the yttrium content increased; and similarly, the sintered density varied slightly between 5.47 and 5.51 g/cm 3 . The threshold field exhibited a maximum value (5387 V/cm) when the yttrium content was 0.1 mol%. The highest nonlinear exponent (67) was obtained when the yttrium content was 0.05 mol%. The donor concentration increased in the range of (2.46-5.56) 10 17 cm -3 as the yttrium content increased, and the maximum barrier height was obtained (1.24 eV) when the yttrium content reached 0.05 mol%.