| abstract |
A mixed ionic conductor is disclosed comprising annion conductive oxide having a perovskite structure ofnthe formula Ba e Zr 1-z M 2 z O 3-β , wherein n 0.9 ≤ e ≤ 1; n M 2 is at least one element selected from the groupnconsisting of trivalent rare earth elements, Bi, Ga, Sn,nSb and In; nwith 0.01 ≤ z ≤ 0.3; nand (2 + z - 2e)/2 ≤ β < 1.5. The mixed ionic conductornmay be used in a fuel cell or gas sensor. |