Mineralogical Journal
Online ISSN : 1881-4174
Print ISSN : 0544-2540
ISSN-L : 0544-2540
 
Crystal structure of synthetic zinc monophosphate Zn2(OH)PO4: A polymorph of tarbuttite
Akira KAWAHARAHiromi MORITANIJunji YAMAKAWA
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1994 Volume 17 Issue 3 Pages 132-139

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Abstract

The syntheses of zinc hydroxyl monophosphate Zn2(OH)PO4 were carried out under hydrothermal conditions of 573 K and 200 kg/cm2. The crystal data are: orthorhombic, P21212, a=8.099(1), =8.325(1) and c=5.966(1) Å. The structure was solved by three dimensional Patterson syntheses and refined by least squares methods to give a final residual index of R=0.042. There are four units of Zn2(OH)PO4 in a unit cell and three kinds of zinc atoms with different coordinations, where the first zinc atom is six-coordinated by four oxygen atoms and two hydroxyl groups, the second one is octahedrally coordinated by six oxygen atoms and the third one is five-coordinated by four oxygen atoms and one hydroxyl group forming distorted pyramids. The framework consists of infinite straight chains of Zn–O octahedra along c-axis, connected together by isolated PO4 tetrahedra and distorted Zn–O pyramids. This compound is a polymorph of tarbuttite.

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© 1994 Japan Association of Mineralogical Sciences
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