| 摘要 |
Disclosed is a varistor made of a sintered body comprising a basic component comprising ZnO as a principal component and, as auxiliary components, bismuth (Bi), cobalt (Co), manganese (Mn), anitmony (Sb) and nickel (Ni) in an amount, when calculated in terms of Bi2O3, Co2O3, MnO Sb2O3 and NiO, respectively, of Bi2O3 : 0.1 to 5 mol %, Co2O3 : 0.1 to 5 ml %, MnO : 0.1 to 5 mol %, Sb<2>O3: 0.1 to 5 mol % and NiO : 0.1 to 5 mol %; and an additional component comprising boron (B) in an amount, when calculated in terms of B2O3, of 0.001 to 1 wt% based on said basic component. In another embodiment, the above basic component may further comprise at least one of Al, In and Ga in a prescribed amount and the above additional component may be i) B with or without at least one of Ag and Si in a prescribed amount or ii) a glass containing B in a prescribed amount. |
