Abstract

The title compound, AgMg3(PO4)(HPO4)2, which has been synthesized by the hydro­thermal method, has an alluaudite-like structure which is formed by edge-sharing MgO6 octa­hedra (one of which has symmetry 2), resulting in chains linked together by phosphate groups and hydrogen bonds. The three-dimensional framework leads to two different channels along the c axis, one of which is occupied by Ag+ ions with a square-planar coordination. The Ag+ ions are disordered over two sites in a 0.89 (3):0.11 (3) ratio. The OH groups, which point into the other type of channel, are involved in strong O—H⋯O hydrogen bonds. The title compound is isotypic with the compounds AM 3H2(XO4)(HXO4)2 (A = Na or Ag, M = Mn, Co or Ni, and X = P or As) of the alluaudite structure type.

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