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Clays and Clay Minerals

, Volume 34, Issue 3, pp 250–256 | Cite as

Quantitative Determination of Aluminum-Substituted Goethite-Hematite Mixtures By Mössbauer Spectroscopy

  • D. D. Amarasiriwardena
  • E. DeGrave
  • L. H. Bowen
  • S. B. Weed
Article

Abstract

Mixtures of synthetic Al-substituted goethite (α-Fe0.814Al0.186OOH) and hematite (α-Fe1.658Al0.342O3) (75, 50, 25, 3% hematite by weight) were studied by Mössbauer spectroscopy to evaluate the use of that technique for quantitative analysis. Mössbauer spectra for these mixtures, obtained in the temperature range 12–130 K, were better fitted by a distribution of magnetic fields than by two magnetic sextets. Spectra at 80 K were equally as good as those from lower temperature to determine the hematitegoethite ratio. The recoil-free fractions of the individual components were about equal at any fixed temperature, but thickness effects caused as much as 30% error in the determination of the ratio of components in mixtures.

Key Words

Aluminum Goethite Hematite Mössbauer spectroscopy Quantitative mineralogy 

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Copyright information

© The Clay Minerals Society 1986

Authors and Affiliations

  • D. D. Amarasiriwardena
  • E. DeGrave
    • 1
    • 3
  • L. H. Bowen
    • 1
  • S. B. Weed
    • 2
  1. 1.Department of ChemistryUSA
  2. 2.Department of Soil ScienceNorth Carolina State UniversityRaleighUSA
  3. 3.Laboratory for MagnetismGentBelgium

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