Patent ID: 7294597

Claim:
A translucent ceramic comprising a perovskite having a linear transmittance of 20% or more determined using visible light at a wavelength of 633 nm and a sample having a thickness of 0.4 mm, and a composition represented by the formula Ba{Ti x1 M x2 (A) y (Ta 1-u Nb u ) z } v O w , wherein A is selected from the group consisting of (Mg 1-t Zn t ), Zn and Mg; M is at least one member selected from the group consisting of Sn, Zr, and Hf; w is a positive number for maintaining the electrical neutrality; x 1 +x 2 +y+z=1; 0.02≦x 1 +x 2 ≦0.90; 0.02≦x 1 ≦0.90; 0≦x 2 ≦0.60; y is a positive number; 1.60≦z/y≦2.40; 1.00≦v≦1.05; 0<t<1; and 0≦u≦1.