Patent ID: 7566411

Claim:
A metal composite oxide represented by the following Formula 1: [Formula 1] Sr 5+x+y La 6−x−2y Y y B 4 O 24−δ C z (I) wherein B is at least one element selected from the group consisting of Ta and Nb; C is at least one anion selected from the group consisting of S and halogen atoms, or H + cation; x is a decimal ranging from −1 to 1 (−1≦x≦1); y is a decimal ranging from 0 to 2.5 (0≦y≦2.5); δ is a decimal ranging from 0 to 3 (0≦δ≦3); and z is a decimal ranging from 0 to 7 (0≦z≦7).