Samples of the form, Bi4V2-xMxO11-x/2, were prepared by solid-state reaction. All of the substituted phases retained the -phase structure for x-values of less than 0.20. When x was greater than 0.20, the O-ion high-conductivity -phase was stabilized at room temperature. The highest ionic conductivity (0.0004S/cm at 500K) was observed in the case of Bi4V1.70Ti0.30O10.85. The higher conductivity of the substituted phases when compared with the parent compound, Bi4V2O11, was attributed to the increased numbers of O vacancies which were generated by aliovalent substitutions. In general, the order of the conductivities at 500K was Pb < Zr < Sn < Ti for a given -phase composition. The trend in increasing conductivity was consistent with the trend in decreasing activation energy.

J.Yan, M.Greenblatt: Solid State Ionics, 1995, 81[3-4], 225-33