| 摘要 |
PURPOSE:To enable characteristics to be stable, insulation resistance to be improved, breakdown voltage to be improved, and mechanical strength of insula tion layer to be improved by adding a specified amount of manganese oxide to a material expressed by the general formula (Ba1-xSrx)m(Ti1-y-zZryMz)O3 and making the value within the expression to be within a specified range. CONSTITUTION:A manganese oxide of 0.05-0.2weight% (expressed in terms of to MnO2) is added to a material which is expressed by the general formula (Ba1-xSrx)m(Ti1-y-zZryMz)O3 (M is at least one of Ta and Nb and (m) is the total mol ratio of A site element and B site element) and the value of (m) within the expression is 0.990<=m<=1.000. For example, materials are subject to moisture mixture grinding so that the composition ratio (m) of [(Ba1-xSrx)m (Ti1-y-zZryMz)O3] may be equal to 0.995. The starting material is BaCO3, SrCO2, TiO2, ZrO2 and Ta2O5 with improved purity (99.8% or more) and x, y, and Z are equal to 0.200, 0.090 and 0.005, respectively. Also, a MnO2 of 0.1weight% is added to improve sinterability and insulation resistance. After that, a sintered porcelain is obtained through tentative burning, grinding, molding and calcina tion. |
