It was found that the composition, Na0.40Bi0.60F2.20, exhibited the highest anionic conductivity (10-3S/cm at 100C); with an associated activation energy of 0.46eV.

C.Chartier, J.Grannec, J.M.Réau, J.Portier, P.Hagenmuller: Materials Research Bulletin, 1981, 16[9], 1159-66