inorganic compounds
Sodium nickel tris(phosphate), NaNi(PO3)3, has been shown to be isotypic with AgM(PO3)3 (M = Zn, Co, Ni or Mg), but not with other other known compounds of the form AIBII(PO3)3 (A = Li, Na or K; B is a divalent cation). Na+ and Ni2+ ions alternate in forming columns, and are bridged in pairs by three O atoms [NaNi 3.190 (2) Å].