Electrochemical solid-state device comprising lanthanide calcium manganite

The present invention relates to an interconnect for an electrically driven solid electrolyte oxygen separation device comprising a composition of matter represented by the general formula: LnxCax'Ax"MnyBy'O3- delta wherein Ln is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A is selected from the group consisting of Sr, Ba and Y; B is selected from the group consisting of Cu, Co, Cr, Fe, Ni, Zn, Nb, Zr, V, Ta, Ti, Al, Mg, and Ga; 0.1 ≤x≤0.9; 0.1≤x'≤0.9; 0≤x"≤0.5; 0.5 < y