| 摘要 |
PURPOSE:To obtain high varistor voltage by incorporating 5.00 to 26.00mol% of CaTiO3, 0.05 to 0.50mol%, of total amount of a specific oxide 0.05 to 0.50mol% of total amount of different specific oxides and 0.50 to 1.00mol% of SiO2. CONSTITUTION:5.00 to 26.00mol% of CaTiO2, 0.05 to 0.50mol% of total amount of one kind or more of oxides selected from the group of oxides of La, Ta, 0.05 to 0.50mol% of total amount of one kind or more of oxides selected from the groups of oxides of respective elements of Cu, Mo, Fe, Mn, 0.50 to 1.00% of SiO2 are respectively added to a main component SrTiO2 mixed and made into grains for being molded by using a metal mold. This ring-shaped mold is fired in a mixed gas atmosphere of nitrogen gas and hydrogen gas and this sintered body is subjected to several heat treatments at 950 to 1000 deg.C for three hours. In this way, a large non-linear coefficient and high varistor voltage can be obtained. |
