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Physics and Chemistry of Minerals

, Volume 45, Issue 4, pp 361–366 | Cite as

Synthesis and crystal structure of chromium-bearing anhydrous wadsleyite

  • E. A. Sirotkina
  • L. Bindi
  • A. V. Bobrov
  • S. M. Aksenov
  • T. Irifune
Original Paper
  • 182 Downloads

Abstract

A chromium-bearing wadsleyite (Cr-Wad) was synthesized in the model system Mg2SiO4–MgCr2O4 at 14 GPa and 1600 °C and studied from the chemical and structural point of views. Microprobe data gave the formula Mg1.930Cr0.120Si0.945O4, on the basis of 4 oxygen atoms. The crystal structure has been studied by single-crystal X-ray diffraction. The orthorhombic unit-cell parameters are: a = 5.6909(5) Å, b = 11.4640(10) Å, c = 8.2406(9) Å, V = 537.62(9) Å3, Z = 8. The structure, space group Imma, was refined to R 1 = 5.99% in anisotropic approximation using 1135 reflections with F o > 4σ(F o) and 43 parameters. Chromium was found to substitute for both Mg at the octahedral sites and Si at the tetrahedral site, according to the reaction VIMg2+ + IVSi4+ = VICr3+ + IVCr3+. On the whole, the structural topology is nearly identical to that of pure wadsleyite. The successful synthesis of Cr-Wad may be important for the thermobarometry of mantle phase associations.

Keywords

Wadsleyite High-pressure experiments Single-crystal X-ray diffraction Chromium Earth’s mantle 

Notes

Acknowledgements

The research was supported by the Russian Science Foundation (project no. 17-17-01169 to AB and ES). Structural studies were partly supported by the Foundation of the President of the Russian Federation (grant no. MK-1277.2017.5 to ES).

Supplementary material

269_2017_926_MOESM1_ESM.cif (15 kb)
Supplementary material 1 (CIF 15 KB)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • E. A. Sirotkina
    • 1
    • 2
    • 3
  • L. Bindi
    • 4
    • 5
  • A. V. Bobrov
    • 1
    • 3
  • S. M. Aksenov
    • 1
    • 2
    • 6
  • T. Irifune
    • 7
    • 8
  1. 1.Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of SciencesMoscowRussia
  2. 2.Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics”Russian Academy of SciencesMoscowRussia
  3. 3.Geological FacultyMoscow State UniversityMoscowRussia
  4. 4.Dipartimento di Scienze della TerraUniversità di FirenzeFlorenceItaly
  5. 5.CNR, Istituto di Geoscienze e Georisorse, Sezione di FirenzeFlorenceItaly
  6. 6.Institute of Organoelement Compounds RASMoscowRussia
  7. 7.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  8. 8.Earth Life Science InstituteTokyo Institute of TechnologyTokyoJapan

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