Patent ID: 7476376

Claim:
A metal composite oxide having the new crystal structure characterized by conditions (a) to (c): (a) a space group of Fd-3m (no. 227); (b) a unit cell parameter of 17.0±1.0 Å; and (c) crystallographic positions in a unit cell occupied by cations 8b, 48f, 32e, 16d and 16c with site occupancies of greater than 0 and less than or equal to 1, wherein the coordinates of cations (X, Y, Z) are as follows: 8b (3/8, 3/8, 3/8), 48f (x, 1/8, 1/8), wherein 0.37≦x≦0.43, 32e (x, x, x), 0.20≦x≦0.26, 16d (1/2, 1/2, 1/2), and 16c (0,0,0).