酸化亜鉛バリスターにおけるコバルトの添加効果

概要

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The effect of cobalt doping on the electrical properties of praseodymium type of zinc oxide varistor was estimated from the viewpoints of the carrier density, the crystalline phase and the grain boundary oxidation. The non-ohmic coefficient, α, expressed as I=(V/C)^α was increased initially, through the maximum at 2-5 at% and then decreased with increasing the doping amount. Its value corresponded with the height of the energy barrier at the grain boundary measured by ICTS (isothermal capacitance transient spectroscopy). The increasing factors in the α by CoO doping were the decrease in the carrier density and the increase in the amount and the bonding strength of the chemisorbed oxygen. The decreasing factor was the precipitation of CoO.
1998-03-25