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Magnesium aluminium chromite.

Joab S Santos1, Antônio C Doriguetto, Nelson G Fernandes

  • 1Department of Chemistry, Federal University of Minas Gerais, CP 702, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.

Acta Crystallographica. Section C, Crystal Structure Communications
|March 8, 2005
PubMed
Summary

Cation distribution in natural magnesium aluminium chromite spinel was determined. The study identified specific distributions in tetrahedral and octahedral sites, revealing a probable structural model for this complex oxide mineral.

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Area of Science:

  • Mineralogy and crystallography
  • Materials science
  • Geochemistry

Background:

  • Spinel group minerals are crucial in geological and industrial applications.
  • Understanding cation distribution in complex spinels like magnesium aluminium chromite is vital for predicting their properties.
  • Natural spinels often exhibit complex cation ordering due to various geological conditions.

Purpose of the Study:

  • To determine the precise cation distribution in a natural magnesium aluminium chromite spinel.
  • To elucidate the structural model governing cation occupancy in tetrahedral and octahedral sites.
  • To provide a detailed crystallographic and chemical characterization of the spinel.

Main Methods:

  • Electron-microprobe analysis for elemental composition.

Related Experiment Videos

  • Mossbauer spectroscopy for oxidation state and site occupancy of iron.
  • Single-crystal X-ray diffraction for precise structural determination.

    • Main Results:

    • The chemical formula was refined to Al(0.41)Cr(1.42)Fe(0.65)Mg(0.4)O(4).
    • The most probable cation distribution model is (Mg(0.40(11))(2+),Al(0.28(5))(3+),Fe(0.39(4))(2+))[Al(0.13(5))(3+),Cr(1.42(6))(3+),Fe(0.26(4))(3+),Phi(0.19)]O(4)(2-).
    • This model includes vacancies (Phi) in the octahedral site and details the distribution of Mg(2+), Al(3+), Fe(2+), Fe(3+), and Cr(3+) ions.

    Conclusions:

    • The study successfully determined the cation distribution in a complex natural spinel.
    • The findings provide a validated structural model for magnesium aluminium chromite spinel.
    • This detailed characterization contributes to the understanding of spinel solid solutions and their formation.