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Mn-Substituted Goethite and Fe-Substituted Groutite Synthesized At Acid pH1

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Clays and Clay Minerals

Abstract

Mn-substituted iron oxides were synthesized by coprecipitating Fe(NO3)3 and Mn(SO4) solutions with NH4OH, adjusting the suspensions to pH 4 or 6, and then keeping the suspensions at 55°C for 62 days. The Mn mole fraction of the final products ranged from 0 to 0.3. X-ray powder diffraction patterns showed that goethite and hematite formed in each Fe-containing system. Groutite formed in systems having initial Mn mole fractions ≥0.35. Only manganite and hausmannite formed in the pure Mn systems. The oxalate-soluble Fe in the samples increased as the Mn mole fraction increased and was slightly larger for the pH 6 series.

For samples that contained the largest Mn mole fraction, the b and c dimensions of the goethite unit cell were shifted toward those of groutite, and the b and c dimensions of the groutite unit cell were shifted toward those of goethite. Assuming the Vegard rule holds for the unit-cell c dimension, the goethite accommodated a maximum Mn mole fraction of 0.34, and the groutite accommodated a maximum Fe mole fraction of 0.31. The unit-cell dimensions of hematite did not vary systematically with the mole fraction of Mn in solution, probably because little Mn substituted into the hematite structure.

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Authors and Affiliations

  1. Agronomy Department, Purdue University, West Lafayette, Indiana, 47907, USA

    M. H. Ebinger & D. G. Schulze

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  1. M. H. Ebinger
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  2. D. G. Schulze
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Journal article number 11,250, Purdue Agricultural Experiment Station.

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Ebinger, M.H., Schulze, D.G. Mn-Substituted Goethite and Fe-Substituted Groutite Synthesized At Acid pH1. Clays Clay Miner. 37, 151–156 (1989). https://doi.org/10.1346/CCMN.1989.0370206

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  • DOI: https://doi.org/10.1346/CCMN.1989.0370206

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