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

Toon Van Alboom (UGent) and Eddy De Grave (UGent)
(2016) AMERICAN MINERALOGIST. 101(3-4). p.735-743
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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 K – 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 field theory. A most adequate description of the experimental ∆E<sub>Q</sub>(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 inter-atomic 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 with the purpose of supplying a future Moon base on site with oxygen and water.
Keywords
Mössbauer spectroscopy, Ilmenite, hyperfine interactions, temperature variation, Moon base, FERRIC MOSSBAUER FRACTIONS, CRYSTAL-STRUCTURE, ILMENITE FETIO3, SPECTRA, FIELD, ENERGY

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Chicago
Van Alboom, Toon, and Eddy De Grave. 2016. “Temperature Dependences of the Hyperfine Parameters of Fe2+ in FeTiO3 as Determined by 57Fe-Mössbauer Spectroscopy.” American Mineralogist 101 (3-4): 735–743.
APA
Van Alboom, T., & De Grave, E. (2016). Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy. AMERICAN MINERALOGIST, 101(3-4), 735–743.
Vancouver
1.
Van Alboom T, De Grave E. Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy. AMERICAN MINERALOGIST. 2016;101(3-4):735–43.
MLA
Van Alboom, Toon, and Eddy De Grave. “Temperature Dependences of the Hyperfine Parameters of Fe2+ in FeTiO3 as Determined by 57Fe-Mössbauer Spectroscopy.” AMERICAN MINERALOGIST 101.3-4 (2016): 735–743. Print.
@article{7189127,
  abstract     = {The temperature variations of the ferrous M{\"o}ssbauer parameters for a synthetic ilmenite (FeTiO3) have been determined and interpreted over a very wide temperature range (5 K -- 900 K). The Debye model of the lattice vibrations was used in interpreting the temperature dependence of the center shift, yielding a characteristic M{\"o}ssbauer temperature of 350 {\textpm} 20 K and a zero-Kelvin intrinsic isomer shift of 1.30 {\textpm} 0.01 mm/s. The temperature dependence of the ferrous M{\"o}ssbauer quadrupole splitting was interpreted using crystal field theory. A most adequate description of the experimental \unmatched{2206}E{\textlangle}sub{\textrangle}Q{\textlangle}/sub{\textrangle}(T) curve was obtained assuming an energy shift of at the most ca. 500 {\textpm} 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 inter-atomic spacing, indicating a first-order magnetic transition at the magnetic-paramagnetic transition temperature of 59.0 {\textpm} 0.5 K. 
This detailed presentation of M{\"o}ssbauer 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 M{\"o}ssbauer spectroscopy the reduction process of the mined mineral with the purpose of supplying a future Moon base on site with oxygen and water.},
  author       = {Van Alboom, Toon and De Grave, Eddy},
  issn         = {0003-004X},
  journal      = {AMERICAN MINERALOGIST},
  keyword      = {M{\"o}ssbauer spectroscopy,Ilmenite,hyperfine interactions,temperature variation,Moon base,FERRIC MOSSBAUER FRACTIONS,CRYSTAL-STRUCTURE,ILMENITE FETIO3,SPECTRA,FIELD,ENERGY},
  language     = {eng},
  number       = {3-4},
  pages        = {735--743},
  title        = {Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-M{\"o}ssbauer spectroscopy},
  url          = {http://dx.doi.org/10.2138/am-2016-5262},
  volume       = {101},
  year         = {2016},
}

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