I.R. Spectroscopic Evidence for Interaction between Hydronium Ions and Lattice OH Groups in Montmorillonite

J. D. Russell and A. R. Fraser
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland

Abstract: At low levels of hydration, exchangeable D+ in montmorillonite interacts with lattice OH groups and quantitatively converts AlMgOH groups to AlMgOD. Hydroxyl groups coordinated to two Al ions undergo a slower exchange, the extent of which is restricted by octahedral Fe3+ ions.

The OH stretching vibration of AlMgOH groups in montmorillonite is assigned an unusually high frequency (3687 cm−1) compared with that of the same group in phengites (3602 cm−1).

Clays and Clay Minerals; March 1971 v. 19; no. 1; p. 55-59; DOI: 10.1346/CCMN.1971.0190106
© 1971, The Clay Minerals Society
Clay Minerals Society (www.clays.org)