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American Mineralogist; July 2007; v. 92; no. 7; p. 989-993; DOI: 10.2138/am.2007.2570
© 2007 Mineralogical Society of America
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Experimental evidence of sixfold oxygen coordination for phosphorus

Fabrice Brunet1,*, Anne-Marie Flank2, Jean-Paul Itié2, Tetsuo Irifune3 and Pierre Lagarde2

1 Laboratoire de Géologie, CNRS-ENS—UMR8538, 24 rue Lhomond, 75005 Paris, France
2 Synchrotron-SOLEIL, BP48, 91192 Gif s/Yvette, France
3 Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan

Correspondence: * E-mail: brunet{at}geologie.ens.fr

Phosphorus, a group V element, has always been found so far in minerals, biological systems, and synthetic compounds with an oxygen coordination number of four (i.e., PO4 groups). We demonstrate using phosphorus K-edge XANES spectroscopy that this element can also adopt a sixfold oxygen coordination (i.e., PO6 groups). This new coordination was achieved in phosphorus-doped (1 wt% P2O5 level) SiO2-stishovite synthesized at 18 GPa and 1873 K and quenched to ambient conditions. This change of phosphorus coordination at high pressure within a dense silicate structure is particularly relevant to phosphorus mineralogy (and geochemistry) in the deep Earth. With a mantle abundance below 0.25 wt%, phosphorus has been shown to be mainly hosted by silicates (e.g., olivine) in the Earth’s upper-mantle, in the fourfold-coordinated silicon sites. In the lower mantle where all silicon is sixfold coordinated, we show here that phosphorus has the crystal-chemical ability to remain incorporated into silicate structures.

Key Words: Phosphorus • coordination • XANES • stishovite • berlinite • lower mantle






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