Patent ID: 7638458

Claim:
A Mo—Bi—Nb—Te based composite metal oxide, which is represented by the following Formula 1: MO a Bi b Nb c Te d A e B f C g D h E i F j O k [Formula 1] wherein Mo represents molybdenum, Bi represents bismuth, Nb represents niobium, and Te represents tellurium; A is at least one element selected from the group consisting of W, Sb, As, P, Sn and Pb; B is at least one element selected from the group consisting of Fe, Zn, Cr, Mn, Cu, Pd, Ag and Ru; C is at least one element selected from the group consisting of Co, Cd, Ta, Pt and Ni; D is at least one element selected from the group consisting of Si, Al, Zr, and Ce; E is at least one element selected from the group consisting of Se, Ga, Ti, Ge, Rh and Au; F is at least one element selected from the group consisting of Na, K, Li, Rb, Ca, Sr, and Ba; each of a, b, c, d, e, f, g, h, i, j and k represents the atomic ratio of each element; wherein when a=12, b is 0.01˜20, c is 0.001˜20, d is 0.001˜20, e is 0˜15, f is 0˜20, g is 0˜20, h is 0˜10, i is 0˜10, j is 0˜10, and k is a number defined by the oxidation state of each of the above elements.