Abstract
Infrared spectroscopy is used to distinguish between octahedral and tetrahedral substitutions in an interstratified illite-smectite clay. The Hofmann-Klemen (Li) test suggests that the AlMg□ and FeMg□ octahedral vacancies are preferentially occupied by Li after thermal treatment at 250°C. The ammonium (Chourabi-Fripiat) test reveals the beidellitic character by the formation of two OH stretching modes upon deammonation. The illitic layers are not affected since K is not exchangeable.
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Srasra, E., Bergaya, F. & Fripiat, J.J. Infrared Spectroscopy Study of Tetrahedral and Octahedral Substitutions in an Interstratified Illite-Smectite Clay. Clays Clay Miner. 42, 237–241 (1994). https://doi.org/10.1346/CCMN.1994.0420301
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DOI: https://doi.org/10.1346/CCMN.1994.0420301