Taiyo Yuden Co., Ltd.

Osamu Hattori

Chie Kawamura

Kazumichi Hiroi

A manufacturing method of ceramic powder includes mixing a barium carbonate having a specific surface are of 15 m/g or more, a titanium dioxide having a specific surface area of 20 m/g or more, a first compound of a donor element having a larger valence than Ti, and a second compound of an acceptor element having a smaller valence than Ti and having a larger ion radium than Ti and the donor element, and synthesizing barium titanate powder by calcining the barium carbonate, the titanium dioxide, the first compound and the second compound until a specific surface area of the barium titanate powder becomes 4 m/g or more and 25 m/g or less.

Manufacturing method of ceramic powder

A manufacturing method of ceramic powder includes: synthesizing barium titanate powder from barium carbonate, titanium dioxide, manganese carbonate, and one of ammonium molybdate and tungsten oxide, wherein: a solid solution amount of the donor element is 0.05 mol or more and 0.3 mol or less; a solid solution amount of the accepter element with respect to the barium titanate is 0.02 mol or more and 0.2 mol or less on a presumption that the amount of the barium titanate is 100 mol and the acceptor element is converted into an oxide; and relationships y&#x2265;&#x2212;0.0003x+1.0106, y&#x2264;&#x2212;0.0002x+1.0114, 4&#x2264;x&#x2264;25 and y&#x2264;1.0099 are satisfied when a specific surface area of the ceramic powder is 'x' and an axial ratio c/a of the ceramic powder is 'y'.

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Takasaki, Japan

Osamu Hattori