| 摘要 |
There is provided a semiconductor ceramic composition in which a portion of Ba of BaTiO 3 is substituted by Bi-Na, which exhibits an excellent jump characteristic while reducing room temperature resistivity and which also reduces room temperature resistivity and exhibits small change with time. A semiconductor ceramic composition which is represented by a composition formula of [(Bi ¸ -Na ´ ) x (Ba 1-y R y ) 1-x ]TiO 3 (where R is at least one kind of rare earth elements), in which x, y, ¸ and ´ satisfy 0<x‰¤0.3, 0<y‰¤0.02, 0.46<¸‰¤0.62 and 0.45‰¤´‰¤0.60 and a molar ratio Bi/Na of Bi to Na in a sintered body is more than 1.02 but 1.20 or less, is provided. Also, a method for producing a semiconductor ceramic composition containing a means for performing weighing such a manner that the molar ratio Bi/Na of Bi to Na is 1.05 to 1.24 so that an amount of Bi in a Bi raw material powder becomes larger than an amount of Na in an Na raw material powder at preparation of a (BiNa)TiO 3 calcined powder or a means for adding a Bi raw material powder at preparation of a mixed calcined powder to perform adjustment so that the molar ratio Bi/Na is 1.04 to 1.23, in order that the molar ratio Bi/Na of Bi to Na in a sintered body becomes more than 1.02 but 1.20 or less. |
