Patent ID: 8613798

Claim:
A transition metal oxide insulator composition having a tuned band gap comprising: a. a transition metal oxide having a crystalline structure selected from the group consisting of a perovskite crystalline structure and a perovskite-like crystalline structure, said transition metal oxide comprising: at least one first element selected from the group consisting of Bi, Ca, Ba, Sr, Li, Na, Mg, K, Pb, and Pr; and at least one second element selected from the group consisting of Ti, Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir, and Pt; and b. at least one correlated insulator integrated into said crystalline structure, said correlated insulator comprising REMO 3 , wherein RE is at least one element selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and wherein M is at least one element selected from the group consisting of Co, V, Cr, Ni, Mn, and Fe; said composition being characterized by a band gap of less than 4.5 eV.