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Mössbauer Studies of Synthetic and Soil-Occurring Aluminum-Substituted Goethites¹

ABSTRACT

Mössbauer spectroscopy of partially Al-substituted synthetic goethites shows marked variation of the internal magnetic field (H) with Al substitution. Empirical relations are reported which allow using observed H values to estimate % Al in the oxides present in soil clay. Relaxation effects due to small particle size and substitution of Al³⁺ for Fe³⁺ complicate the spectra, and in many cases liquid nitrogen or liquid helium temperatures are necessary to resolve the components. However, the relaxation effects observed may be related qualitatively to particle size of the Fe oxides present. The utility of the Mössbauer technique was tested with a number of soil samples containing Al-substituted goethite.

¹ Paper no. 5814 of the Journal Series of the North Carolina Agric. Res. Service, Raleigh, N.C. 27650.

² Former Research Assistant, Professor of Chemistry, and Professor of Soil Science, North Carolina State University, Raleigh, N.C. 27650, and Assistant Professor, Agronomy Department, Ohio State University, Columbus, OH 43210, respectively. Current address of senior author is Tea Research Institute. Talawakele, Sri Lanka.

Received for publication November 27, 1978. Accepted for publication March 21, 1979.

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