CPC H01G 4/30 (2013.01) [B32B 18/00 (2013.01); C01G 23/006 (2013.01); C04B 35/4682 (2013.01); C04B 35/62655 (2013.01); C04B 35/62685 (2013.01); H01G 4/1218 (2013.01); H01G 4/1227 (2013.01); C01P 2002/34 (2013.01); C01P 2002/50 (2013.01); C01P 2002/72 (2013.01); C01P 2002/88 (2013.01); C01P 2006/12 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3239 (2013.01); C04B 2235/3256 (2013.01); C04B 2235/3258 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3267 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/5296 (2013.01); C04B 2235/5409 (2013.01); C04B 2235/663 (2013.01); C04B 2237/346 (2013.01); C04B 2237/68 (2013.01)] | 4 Claims |
1. A manufacturing method of ceramic powder comprising:
mixing a barium carbonate having a specific surface are of 15 m2/g or more, a titanium dioxide having a specific surface area of 20 m2/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 m2/g or more and 25 m2/g or less,
wherein:
a solid solution amount of the donor element with respect to the barium titanate is 0.05 mol or more and 0.3 mol or less on a presumption that an amount of the barium titanate is 100 mol and the donor element is converted into an oxide;
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≥−0.0003x+1.0106, y≤−0.0002x+1.0114, 4≤x≤25 and y≤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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