On Dehydration of Bound Water of Sepiolite

Hiroshi Nagata, Susumu Shimoda and Toshio Sudo
Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Tokyo, Japan

Abstract: Bound water of sepiolite dehydrates in two steps in the temperature range of 250–650°C, as shown in the TG-curve. These steps are described here as steps II and III. At step II, half of the bound water is removed; other half at step III. From step II to III, discontinuous changes are confirmed in such properties as activation energy of dehydration, a-dimension, axial ratio, and intensities and spacings of X-ray powder reflections. A structural state at step II may be recognized as a distinct phase in the dehydration process.

Clays and Clay Minerals; June 1974 v. 22; no. 3; p. 285-293; DOI: 10.1346/CCMN.1974.0220310
© 1974, The Clay Minerals Society
Clay Minerals Society (www.clays.org)