Patent ID: 8076256

Claim:
A BaTiO 3 semiconductor ceramic composition in which a part of the Ba is substituted with Bi—Na, the semiconductor ceramic composition being represented by a composition formula: [(BiNa) x (Ba 1-y R y ) 1-x ]TiO 3 , wherein R is at least one rare earth element and x and y each satisfy 0<x≦0.3 and 0<y≦0.02, wherein the semiconductor ceramic composition is obtained by sintering a mixed calcined powder comprising a calcined powder of (BaR)TiO 3 , wherein R is at least one rare earth element), and a calcined powder of (BiNa)TiO 3 ; and wherein BaCO 3 and/or TiO 2 is/are added to the calcined BT powder or the calcined BNT powder or to the mixed calcined powder, and the amount of BaCO 3 and/or TiO 2 added is such that the amount of BaCO 3 is at most 30 mol % and the amount TiO 2 is at most 30 mol % when the total amount of the calcined BT powder and BaCO 3 and/or TiO 2 is taken as 100 mol %.