Patent ID: 7029602

Claim:
An inorganic oxide expressed by a chemical formula III (1−x)MLn 2 QR 4 O 12 .xLn 3 R 5 O 12 (III) where M is at least one element selected from the group consisting of Mg, Ca, Sr, and Ba, wherein M is 50 atomic % or more of Ba; Ln is at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; Q is at least one element selected from the group consisting of Si, Ge, Sn, and Pb; R is at least one element selected from the group consisting of B, Al, Ga, In, and Tl; and x is in a range of 0≦x≦0.7.