Citation: Mauvy, F.; Launay, J.C.; Darriet, J. (2005). Synthesis, crystal structures and ionic conductivities of Bi14 P4 O31 and Bi 50 V4 O85. Two members of the series Bi18-4m M4m O27+4m (M = P, V) related to the fluorite-type structure.. Journal of Solid State Chemistry, 178, pp. 2015-2023.