The structure and electric conductivity of the fast oxide ion conductors Bi13(Mo,M)5O34, i.e. Bi[Bi12O14][(Mo,M)O4]5 with M = Li, Mg, Al, Si, Ge and V were investigated by using X-ray powder diffraction experiments and alternating-current impedance spectroscopy. The compounds of this original family were isostructural with Bi13Mo4VO34; they crystallize in the monoclinic system with the space group P2/c. The structures exhibited typical [Bi12O14]n columns developed along [010], surrounded by (Mo,M)O4 tetrahedra packed in layers parallel to (100) and (001), the electrical balance of the network being achieved by Bi atoms at the intersection of these planes. The syntheses, X-ray powder pattern analyses and conductivity measurements were reported; the best anionic conductor of the family was proved to be Bi[Bi12O14][(Mo0.933Al0.067)O4]5 with σ980K = 1.4 x 10-2S/cm.

Ionic Conductivity of the Oxide Family Bi[Bi12O14][(Mo,M)O4]5 with M = Li, Mg, Al, Si, Ge and V. B.Bastide, R.Enjalbert, P.Salles, J.Galy: Solid State Ionics, 2003, 158[3-4], 351-8