Multilayer ceramic capacitor, ceramic powder, manufacturing method of multilayer ceramic capacitor and manufacturing method of ceramic powder

Ceramic powder comprising:

• barium titanate as a main component,
• wherein:
• a donor element having a larger valence than Ti is solid-solved in the barium titanate;
• an acceptor element having a smaller valence than Ti and larger ion radius than Ti and the donor element is solid-solved in the barium titanate,
• 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”.

A manufacturing method of a multilayer ceramic capacitor comprising:

• synthesizing barium titanate powder by solid-solving a donor element and an acceptor element in barium titanate, the donor element having a larger valence than Ti, the acceptor element having a smaller valence than Ti and having a larger ion radius than Ti and the acceptor element;
• forming green sheets with use of the barium titanate powder;
• forming a multilayer structure by alternately stacking the green sheets and conductive pastes for forming internal electrodes;
• and
• baking the multilayer structure;
• 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;
• and
• 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.

A manufacturing method of ceramic powder comprising:

• synthesizing barium titanate powder by solid-solving a donor element and an acceptor element in barium titanate, the donor element having a larger valence than Ti, the acceptor element having a smaller valence than Ti and having a larger ion radius than Ti and the acceptor element,
• 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”.