Patent ID: 7682494

Claim:
A material for use in proton transport, comprising a formula A x B y C z O d , wherein: A is selected from a group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof, B is selected from a group consisting of Zr, Ce, Hf, and mixtures thereof; C is selected from a group consisting of Li, Be, B, C, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Cs, Ba, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Fr, Ra, La, Pr, Nd, Pm, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof; x and y vary according to 3.2≦x+y≦4.8, the subscripts x, y, z and d are adjusted by a common multiplier so that x≠y, z varies according to 0≦z≦0.8, and wherein if z=0, A and B are different materials; and d takes a value consistent with the oxidation states of A, B, and C and the stoichiometry x, y, and z to balance the net formula charge, and A and/or C are present in effective amounts for improving proton transport relative to La 2 Zr 2 O 7 .