Patent ID: 7396790

Claim:
A translucent ceramic comprising a perovskite compound having a composition represented by the general formula (Ba 1-s-t Sr s Ca t )(Ti x1 M x2 B1 y B2 z ) v O w in which M is at least one of Sn, Zr and Hf, B1 is at least one of Mg, Zn, Y and In, B2 is at least one of Ta and Nb, 0≦s≦0.92, 0.01≦t≦0.40, 0≦x1; x1+x2+y+z=1, 0<x1+x2≦0.9, 0≦x2≦0.6, 1.00≦z/y≦2.40, and 0.97≦v≦1.04, and w is a positive number for maintaining electrical neutrality.