Startseite Structure of NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 glasses and glass-ceramics
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Structure of NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 glasses and glass-ceramics

  • Mostafa Ahmadzadeh ORCID logo , Alex Scrimshire , Lucy Mottram , Martin C. Stennett , Neil C. Hyatt , Paul A. Bingham und John S. McCloy
Veröffentlicht/Copyright: 20. September 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 9

Abstract

The crystallization of iron-containing sodium silicate phases holds particular importance, both in the management of high-level nuclear wastes and in geosciences. Here, we study three as-quenched glasses and their heat-treated chemical analogs, NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 (with nominal stoichiometries from feldspathoid, pyroxene, and feldspar mineral groups, i.e., Si/Fe = 1, 2, and 3, respectively) using various techniques. Phase analyses revealed that as-quenched NaFeSiO4 could not accommodate all Fe in the glass phase (some Fe crystallizes as Fe3O4), whereas as-quenched NaFeSi2O6 and NaFeSi3O8 form amorphous glasses. NaFeSi2O6 glass is the only composition that crystallizes into its respective isochemical crystalline polymorph, i.e., aegirine, upon isothermal heat-treatment. As revealed by Mössbauer spectroscopy, iron is predominantly present as fourfold-coordinated Fe3+ in all glasses, though it is present as sixfold-coordinated Fe3+ in the aegirine crystals (NaFeSi2O6), as expected from crystallography. Thus, Na-Fe silicate can form a crystalline phase in which it is octahedrally coordinated, even though it is mostly tetrahedrally coordinated in the parent glasses. Thermal behavior, magnetic properties, iron redox state (including Fe K-edge X‑ray absorption), and vibrational properties (Raman spectra) of the above compositions are discussed.

Keywords: Mössbauer; Fe redox; Raman; glass transition; X-ray absorption

Acknowledgments

The authors thank Daniel Neuville from the Institut de Physique du Globe de Paris (IPGP) for help with Raman spectroscopy measurements and interpretation.

  1. Funding

    This research was supported by the Department of Energy Waste Treatment and Immobilization Plant Federal Project Office, contract numbers DE-EM002904 and 89304017CEM000001, under the direction of Albert A. Kruger. A portion of this research used 6-BM of the National Synchrotron Light Source II (NSLSII), a U.S. DOE OS user facility operated for the DOE OS by Brookhaven National Laboratory (BNL) under contract DE-SC0012704. This work was, in part, performed in the HADES/MIDAS facility at the University of Sheffield, established with financial support of the Department for Business, Energy & Industrial Strategy and Engineering and Physical Sciences Research Council (EPSRC) under grant EP/T011424/1 (Hyatt et al. 2020). The U.K. portion of the research was sponsored, in part, by the UK Engineering and Physical Sciences Research Council under grants EP/N017870/1 and EP/S01019X/1.

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Received: 2019-09-13
Accepted: 2020-02-14
Published Online: 2020-09-20
Published in Print: 2020-09-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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  18. Si-rich Mg-sursassite Mg4Al5Si7O23(OH)5 with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase
  19. Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
  20. Memorial of F. Donald Bloss 1920–2020
  21. Book Review
https://doi.org/10.2138/am-2020-7285
Schlagwörter für diesen Artikel
Mössbauer; Fe redox; Raman; glass transition; X-ray absorption

Artikel in diesem Heft

  1. MSA Centennial Review Paper
  2. How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy’s future role
  3. Petrographic and spectral study of hydrothermal mineralization in drill core from Hawaii: A potential analog to alteration in the martian subsurface
  4. Characterizing low-temperature aqueous alteration of Mars-analog basalts from Mauna Kea at multiple scales
  5. Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz
  6. Metasomatism-controlled hydrogen distribution in the Spitsbergen upper mantle
  7. Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica
  8. Density and sound velocity of liquid Fe-S alloys at Earth’s outer core P-T conditions
  9. Some geometrical properties of fission-track-surface intersections in apatite
  10. Thermal equation of state of post-aragonite CaCO3-Pmmn
  11. Structure of NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 glasses and glass-ceramics
  12. Raman spectroscopic studies of O–H stretching vibration in Mn-rich apatites: A structural approach
  13. Characterization of modified mineral waste material adsorbent as affected by thermal treatment for optimizing its adsorption of lead and methyl orange
  14. Morin-type transition in 5C pyrrhotite
  15. The formation of marine red beds and iron cycling on the Mesoproterozoic North China Platform
  16. A multi-methodological study of kernite, a mineral commodity of boron
  17. Letter
  18. Si-rich Mg-sursassite Mg4Al5Si7O23(OH)5 with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase
  19. Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
  20. Memorial of F. Donald Bloss 1920–2020
  21. Book Review
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