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1 results

  • High-pressure crystal structure investigation of synthetic Fe2SiO4 spinel

  • F. Nestola, T. Balić-Žunić, M. Koch-Müller, L. Secco, F. Princivalle, F. Parisi, A. Dal Negro
  • Journal:
    Mineralogical Magazine / Volume 75 / Issue 5 / October 2011
    Published online by Cambridge University Press:
    05 July 2018, pp. 2649-2655

  • The crystal structure of Fe2SiO4 spinel at room temperature was investigated at seven different pressures by X-ray diffraction, using a diamond anvil cell to examine the influence of Fe substitution on ringwoodite behaviour at high pressure. The results compared with those of a pure Mg endmember show that the substitution of Fe into the spinel structure causes only small changes in the compression rate of coordination polyhedra and the distortion of the octahedron. The data show that the compression rate for the octahedron and tetrahedron in (Mg,Fe)2SiO4 can be considered statistically equal for FeO6 and MgO6, as well as for SiO4 in both the endmembers. This shows why almost identical bulk moduli are reported along the solid solution in recent literature.