| 摘要 |
PURPOSE:To obtain the title resistance element having a large varister voltage and nonlinear coefficient and a large surge-withstand voltage by a method wherein a specific quantity in total of Na2O, TiO2 and V2O5 is contained in a base material consisting of (Sr1-xCaX), a specific quantity of oxides of some of Nb, W, Ta, In, Y and rare-earth elements. CONSTITUTION:Na2O, TiO2 and V2O5 (0<Na2, 0<TiO2 and 0<V2O5) of 0.01 to 2.0mol% in total are contained in a base material consisting of (Sr1-XCaX) TiO3 (provided that x<=0.25) of 98.0 to 99.9mol%, at least one of oxides of Nb, W, Ta, In, Y and rare-earth elements of 0.1 to 2.0mol%. According to this constitution, both varister characteristics and capacitor characteristics can be provided, a large varister voltage of about 100 to 300V and nonlinear coefficient of 15 or above can be obtained, and it can withstand a surge up to 5000A/cm<2>. As a result, a grain boundary oxidation type voltage dependent nonlinear resistance element, having a large varister voltage and nonlinear coefficient and a large surge withstand voltage, can be obtained. |
