| 摘要 |
PURPOSE:To obtain a porcelain composition giving a resistor non-linear to electric voltage having a large nonlinear coefficient and a high surge resistance by containing fixed amounts of Na2O, SiO2 and Bi2O3, in a semiconductive porcelain containing a specific composition of strontium titanate-based oxide as a principal component. CONSTITUTION:A semiconductive porcelain composed of 98-99.9mol% oxide having a composition expressed by the formula (x<=0.3; y<=0.25) and 2-0.1mol% an agent making semiconductor (e.g. Y2O3) composed of at least a species of oxide selected from Nb, W, Ta, IN or rare earth elements is produced. Next, total 0.01-2mol% Na2O, SiO2 and Bi2O3 (0<Na2O; 0<SiO2; 0<Bi2O3) is contained in the semiconductive porcelain as an oxidizer to afford the aimed a porcelain composition for a resistor nonlinear to electric voltage. A resistor element non-linear to electric voltage is obtained by forming silver electrodes on opposing faces of a porcelain unit produced from the porcelain composition. |
