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Crystal structure of a new polymorphic modification of niahite, NH 4 MnPO 4 · H 2 O

Crystal structure of a new polymorphic modification of niahite, NH 4 MnPO 4 · H 2 O 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Crystal structure of a new polymorphic modification of niahite, NH 4 MnPO 4 · H 2 O

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References (20)

Publisher
Springer Journals
Copyright
2015 Pleiades Publishing, Inc.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s106377451502011x
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Crystallography ReportsSpringer Journals

Published: Mar 1, 2015

Keywords: Crystallography and Scattering Methods

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