Citation: Benabbas, A; Borel, M M; Grandin, A; Leclaire, A; Raveau, B (1991). Na2+x Nb6 P4 O26 : a novel niobium phosphate bronze isotypic of the m=3 member of the MPTBp family. Journal of Solid State Chemistry, 95, pp. 245-252.
Formula: Na2.667 Nb6 O26 P4
Chemical name:Sodium niobium phosphorus oxide (2.7/6/4/26)