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Compressibility and high-pressure structural behavior of Mg2Fe2O5

  • Nicki C. Siersch EMAIL logo , Tiziana Boffa Ballaran , Laura Uenver-Thiele and Alan B. Woodland
Published/Copyright: April 3, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 4

Abstract

The compressibility and structural behavior of the novel Mg2Fe2O5 oxide has been investigated by in situ single-crystal X-ray diffraction in a diamond-anvil cell up to a pressure of 17 GPa. The bulk compressibility of Mg2Fe2O5 can be described using a second-order Birch-Murnaghan equation of state (BM2 EoS) with V0 = 352.4(2) Å3 and K0 = 171(4) GPa. Three linear BM2 EoS were used to describe the axial compressibility of Mg2Fe2O5, which was found to be highly anisotropic. The a and b lattice parameters have very similar compressibilies, with a0 = 2.8917(11) Å and linear modulus Ma= 572(16) GPa and b0 = 9.736(3) Å and linear modulus Mb = 583(15) GPa, respectively. The c-axis is the most compressible direction as indicated by the smaller linear modulus [c0 = 12.520(15) Å and Mc= 404(28) GPa]. The Mg2Fe2O5 structure consists of edge-sharing octahedra alternating with layers of trigonal prisms. The compression behavior of the M-O bonds of the M1 and M2 octahedra and of the M3 prisms depend on their location in either an edge-sharing environment, which makes them stiffer, or a corner-sharing environment where they have more freedom to distort and compress. The main compression mechanism consists of a polyhedral tilting around the M2-O1-M2 angle, which decreases with increasing pressure. Mg2Fe2O5 has recently been added to the list of stable end-members of phases with M4O5 stoichiometry, making it a potentially relevant phase in the Earth’s upper mantle and transition zone. To develop thermodynamic activity-composition models for high-pressure phases, it is crucial to know the accurate elastic parameters of each individual end-member. Currently these have only been measured for Mg2Fe2O5 (this study) and Fe4O5.

Keywords: Mg2Fe2O5; Fe4O5; transition zone; high-pressure; compressibility; crystal structure

Acknowledgments

This study was supported by grants from the Deutsche Forschungsgemeinschaft (DFG) to T.B.B. (BO-2550/7-1) and A.B.W. (WO652/20-1). The authors thank Hubert Schulze and Raphael Njul for the preparation of the sample. We thank Steve Jacobsen, Oliver Tschauner, and an anonymous reviewer for their comments, which helped us to improve the manuscript.

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Received: 2016-5-2
Accepted: 2016-11-21
Published Online: 2017-4-3
Published in Print: 2017-4-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5837
Keywords for this article
Mg2Fe2O5; Fe4O5; transition zone; high-pressure; compressibility; crystal structure

Articles in the same Issue

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  5. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  6. Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
  7. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  8. Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
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  36. Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
  38. Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
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