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Structure of Cr2SiO4 and possible metal-metal interactions in crystal and melt

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Abstract

Cr2SiO4 has been prepared both as quench crystals and as an apparently stable subsolidus phase, at T=1600 and 1650 °C, P=37 kbar on Cr2SiO4 and Cr-SiO3 bulk compositions. Crystal structure determination by Rietveld analysis of X-ray powder data from 3 samples show the structure, in space group Fddd, to be related to that of Cd2SiO4 (thenardite Na2SO4-V structure) but with approximately “square planar” coordination of the Cr2+ (d 4) atom. In one of the axial ligand positions, normal to the strongly bonded CrO4 equatorial plane, is found a Cr atom (Cr-Cr=2.75 Å). Stereochemistry permits this contact to be a weak metal-metal bond, though it cannot be ruled out to be a non-bonded result of polyhedral connectivity.

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Authors and Affiliations

  1. Bayerisches Geoinstitut, Universität Bayreuth, D-95440, Bayreuth, Germany

    W. A. Dollase, F. Seifert & H. St. C. O'Neill

  2. Earth and Space Sciences Department, University of California, 90024, Los Angeles, Los Angeles, CA, USA

    W. A. Dollase

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  1. W. A. Dollase
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  2. F. Seifert
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  3. H. St. C. O'Neill
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Dollase, W.A., Seifert, F. & O'Neill, H.S.C. Structure of Cr2SiO4 and possible metal-metal interactions in crystal and melt. Phys Chem Minerals 21, 104–109 (1994). https://doi.org/10.1007/BF00205221

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  • DOI: https://doi.org/10.1007/BF00205221

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