Citation: Benabbas, A; Leligny, H; Borel, M M; Grandin, A; Leclaire, A; Raveau, B (1992). Na~4-x~Nb~7~P~4~O~29~: A Phosphate Niobium Bronze Intergrowth of the Members M=3 snd M=4 of the MPTB's Series Na~x~(NbO~3~)~2m~(PO~2~)~4~. Journal of Solid State Chemistry, 101, pp. 137-144.
Formula: Na3.04 Nb7 O29 P4
Chemical name:Sodium phyllo-heptaniobotetraphosphate (3.04/1)