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Complete substitution of Fe2+ by Mg in Fe4O5: The crystal structure of the Mg2Fe2O5 end-member

  • Tiziana Boffa Ballaran EMAIL logo , Laura Uenver-Thiele and Alan B. Woodland
Published/Copyright: April 9, 2015
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American Mineralogist
From the journal American Mineralogist Volume 100 Issue 2-3

Abstract

The crystal structure of a novel Mg2Fe2O5 oxide synthetized at 15 GPa and 1550 °C has been determined by means of single-crystal X-ray diffraction. This compound is isostructural with Fe4O5 and can be considered as the other end-member of a solid solution between these two oxides involving the substitution of Fe2+ for Mg. The resulting unit-cell lattice parameters a = 2.8889(4), b = 9.7282(4), and c = 12.5523(7) Å are smaller than those of Fe4O5. Mg and Fe3+ cations are found to be disordered among the three crystallographic sites of the Mg2Fe2O5 structure, although preference of Mg for the trigonal prism coordination (M3) is observed. Substitution of Mg into the Fe4O5 structure reduces the octahedral distortion of both the M1 and M2 sites. Like Mg, Cr has recently been found to substitute into Fe4O5, so that Fe3+/ΣFe can vary from 0 to 1.0 in the Mg-Cr-Fe oxides system. Substitution of both Mg and Cr in Fe4O5 also makes this phase more relevant for bulk compositions expected in the Earth’s transition zone and deep upper mantle. M4O5 phases having the CaFe3O5-type structure, therefore, need to be considered as a new addition to the phase relations of several simple oxide systems at pressure and temperature conditions at which the spinel-structured phases become unstable.

Keywords: Mg2Fe2O5; Fe4O5; transition zone; high-pressure; crystal structure
Received: 2014-7-22
Accepted: 2014-9-4
Published Online: 2015-4-9
Published in Print: 2015-2-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2015-5138
Keywords for this article
Mg2Fe2O5; Fe4O5; transition zone; high-pressure; crystal structure

Articles in the same Issue

  1. Anhydrite: An important sulfur binder limiting the climatic impact of subaerial volcanic eruptions
  2. Tweed, twins, and holes
  3. The chemical behavior of fluids released during deep subduction based on fluid inclusions
  4. In situ observation of the pyroxene-majorite transition in Na2MgSi5O12 using synchrotron radiation and Raman spectroscopy of Na-majorite
  5. Prevalence of growth twins among anhedral plagioclase microlites
  6. Intrinsic conditions of magma genesis at the Lunar Crater Volcanic Field (Nevada), and implications for internal plumbing and magma ascent
  7. A rock fragment related to the magnesian suite in lunar meteorite Allan Hills (ALHA) 81005
  8. Trinitite redux: Mineralogy and petrology
  9. Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil
  10. Kojonenite, a new palladium tin telluride mineral from the Stillwater Layered Igneous Intrusion, Montana, U.S.A.
  11. Cathodoluminescence dependence on feldspar mineral structure and implications for forensic geology
  12. Non-invasive assessment of the formation of tourmaline nodules by X-ray microtomography and computer modeling
  13. Alkali influence on the water speciation and the environment of protons in silicate glasses revealed by 1H MAS NMR spectroscopy
  14. Carbonate mineralization in percolated olivine aggregates: Linking effects of crystallographic orientation and fluid flow
  15. The catalytic effect of bound extracellular polymeric substances excreted by anaerobic microorganisms on Ca-Mg carbonate precipitation: Implications for the “dolomite problem”
  16. Experimental study along the magnesio-hornblende–glaucophane join
  17. Direct observation of Ca-Na ordering and structure polarity in Ca-rich intermediate plagioclase feldspar with incommensurate modulated structure
  18. Stability and adhesion of calcite/montmorillonite assembly
  19. Experimental and modeled chlorine solubilities in aluminosilicate melts at 1 to 7000 bars and 700 to 1250 °C: Applications to magmas of Augustine Volcano, Alaska
  20. Cation order-disorder in Fe-bearing pyrope and grossular garnets: A 27Al and 29Si MAS NMR and 57Fe Mössbauer spectroscopy study
  21. Trace and minor elements in galena: A reconnaissance LA-ICP-MS study
  22. A refined monoclinic structure for a variety of “hydrohematite”
  23. Mössbauer spectroscopic study of natural eosphorite, [(Mn,Fe)AlPO4(OH)2H2O]
  24. P-V-T equation of state of Ca3Cr2Si3O12 uvarovite garnet by using a diamond-anvil cell and in-situ synchrotron X-ray diffraction
  25. Possible new Ca-REE-Bi phosphate minerals from a tungsten-rich calcsilicate skarn, Sierra Nevada Mountains, California
  26. Klebelsbergite, Sb4O4SO4(OH)2: Stability relationships, formation in Nature, and refinement of its structure
  27. Balestraite, KLi2VSi4O10O2, the first member of the mica group with octahedral V5+
  28. Prediction of enthalpies of formation of hydrous sulfates
  29. Complete substitution of Fe2+ by Mg in Fe4O5: The crystal structure of the Mg2Fe2O5 end-member
  30. The effect of H2O on F and Cl solubility and solution mechanisms of in aluminosilicate melts at high pressure and high temperature
  31. The elasticity of MgAl2O4–MnAl2O4 spinels by Brillouin scattering and an empirical approach for bulk modulus prediction
  32. Synthesis of stoichiometric nickel aluminate spinel nanoparticles
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