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Crystal structure of a new polymorphic modification of niahite, NH4MnPO4 · H2O

  • Structure of Inorganic Compounds
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Abstract

The crystal structure of a new modification of the niahite mineral NH4MnPO4 · H2O, obtained in the form of single crystals under hydrothermal conditions in the Mn2O3-(NH4)3PO4-H2O system, is determined by X-ray diffraction (Xcalibur-S-CCD diffractometer, R = 0.0259): a = 17.582, b = 4.909, and c = 5.731 Å; space group D 162h = Pnam, Z = 4, D x = 2.497 g/cm3. It is shown that the new compound is a polymorphic modification of niahite; it has a layered structure, which differs from the structure of the mineral by the presence of the center of inversion and the doubled a unit cell parameter. It is proposed to consider the minerals and synthetic analogues of the niahite and triphylite groups as members of the common polysomatic series.

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Correspondence to G. V. Kiriukhina.

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Original Russian Text © G.V. Kiriukhina, O.V. Yakubovich, O.V. Dimitrova, 2015, published in Kristallografiya, 2015, Vol. 60, No. 2, pp. 221–226.

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Kiriukhina, G.V., Yakubovich, O.V. & Dimitrova, O.V. Crystal structure of a new polymorphic modification of niahite, NH4MnPO4 · H2O. Crystallogr. Rep. 60, 198–203 (2015). https://doi.org/10.1134/S106377451502011X

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  • DOI: https://doi.org/10.1134/S106377451502011X

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