" /> " /> " /> AM(PO3)3 (A = alkali metal AM(PO3)3 (A = alkali metal AM(PO3)3 (A = alkali metal Co, Ni or Mg). Columns of alternating Na and Ni atoms lie between the Co, Ni or Mg). Columns of alternating Na and Ni atoms lie between the Co, Ni or Mg). Columns of alternating Na and Ni atoms lie between the `zigzag' polyphosphate chains. `zigzag' polyphosphate chains. `zigzag' polyphosphate chains. and M = transition element) complexes, but resembles AgM(PO3)3 (M = Zn, and M = transition element) complexes, but resembles AgM(PO3)3 (M = Zn, and M = transition element) complexes, but resembles AgM(PO3)3 (M = Zn,