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Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy

  • Antoine Van Alboom EMAIL logo and Eddy De Gravave
Published/Copyright: March 4, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 3

Abstract

The temperature variations of the ferrous Mössbauer parameters for a synthetic ilmenite (FeTiO3) have been determined and interpreted over a very wide temperature range (5–900 K). The Debye model of the lattice vibrations was used in interpreting the temperature dependence of the center shift, yielding a characteristic Mössbauer temperature of 350 ± 20 K and a zero-Kelvin intrinsic isomer shift of 1.30 ± 0.01 mm/s. The temperature dependence of the ferrous Mössbauer quadrupole splitting was interpreted using crystal feld theory. A most adequate description of the experimental ∆EQ(T) curve was obtained assuming an energy shift of at the most ca. 500 ± 50 cm–1 for the highest orbital T2g level relative to the lowest level within this T2g triplet. The temperature dependence of the hyperfine field was interpreted within the molecular field theory of magnetism assuming the magnetic exchange energy being a function of interatomic spacing, indicating a first-order magnetic transition at the magnetic-paramagnetic transition temperature of 59.0 ± 0.5 K.

This detailed presentation of Mössbauer parameters as a function of temperature can serve as a basis for easily detecting ilmenite ore at, for example, the lunar surface and for monitoring by means of Mössbauer spectroscopy the reduction process of the mined mineral, for the purpose of supplying a future Moon base site with oxygen and water.

Keywords: Ilmenite; Mössbauer spectroscopy; hyperfine interactions; temperature variation; Moon base

Acknowledgments

This work was funded by the Fund for Scientific Research, Flanders, Belgium.

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  1. Manuscript handled by M. Darby Dyar.

Received: 2014-11-25
Accepted: 2015-10-27
Published Online: 2016-3-4
Published in Print: 2016-3-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5262
Keywords for this article
Ilmenite; Mössbauer spectroscopy; hyperfine interactions; temperature variation; Moon base

Articles in the same Issue

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
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  7. Research Article
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  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
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  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
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