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The new title phosphate, silver trinickel phosphate bis(hydrogenphosphate), has been synthesized by the hydrothermal method. It has an alluaudite-like structure but shows some differences owing to the presence of the H atoms. The structure is isomorphous with the compounds of general formula AM(3)(XO(4))(HXO(4))(2) (A is Na or Ag, M is Co, Zn or Mn, and X is As or P), with the Ag atom, one Ni atom and one P atom lying on twofold axes.

A new arsenate K1 + 2xNi1 - xFe2(AsO4)3 (x = 1/8) was synthesized using a flux method and its crystal structure was determined from single-crystal X-ray diffraction data. It appears closely related to the α-CrPO4 structure type. The proposed structural model was validated by bond-valence-sum calculations, charge-distribution and Madelung energy analyses

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.003 Å Disorder in main residue R factor = 0.030 wR factor = 0.080 Data-to-parameter ratio = 14.2 For details of how these key indicators were automatically derived from the article, see

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