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SEMICONDUCTOR CERAMIC COMPOSITION, METHOD FOR PRODUCING SAME, PTC ELEMENT AND HEAT GENERATING MODULE
A semiconductor ceramic composition is represented by the formula [(Biθ—Naδ)x(Ba1-yRy)1-x]TiO3 (R being at least one kind of rare earth element), in which x, y, θ and δ satisfy 0<θ≰0.62 and 0.45≰δ≰0.60, includes a molar ratio Bi/Na of Bi to Na in a sintered body of more than 1.02 but 1.20 or less. Methods for producing a semiconductor ceramic composition include weighing the molar ratio Bi/Na of Bi to Na to be 1.05 to 1.24 so an amount of Bi in a Bi raw material powder becomes larger than an amount of Na in an Na raw material powder in a (BiNa)TiO3 calcined powder or adding a Bi raw material powder to a mixed calcined powder so 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.
SEMICONDUCTOR CERAMIC COMPOSITION, METHOD FOR PRODUCING SAME, PTC ELEMENT AND HEAT GENERATING MODULE
A semiconductor ceramic composition is represented by the formula [(Biθ—Naδ)x(Ba1-yRy)1-x]TiO3 (R being at least one kind of rare earth element), in which x, y, θ and δ satisfy 0<θ≰0.62 and 0.45≰δ≰0.60, includes a molar ratio Bi/Na of Bi to Na in a sintered body of more than 1.02 but 1.20 or less. Methods for producing a semiconductor ceramic composition include weighing the molar ratio Bi/Na of Bi to Na to be 1.05 to 1.24 so an amount of Bi in a Bi raw material powder becomes larger than an amount of Na in an Na raw material powder in a (BiNa)TiO3 calcined powder or adding a Bi raw material powder to a mixed calcined powder so 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.
SEMICONDUCTOR CERAMIC COMPOSITION, METHOD FOR PRODUCING SAME, PTC ELEMENT AND HEAT GENERATING MODULE
INO KENTARO (author) / SHIMADA TAKESHI (author) / KIDA TOSHIKI (author)
2016-03-03
Patent
Electronic Resource
English
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