Electron Diffraction and Micrographic Study of the High-Temperature Changes in Illite and Montmorillonite Under Continuous Heating Conditions*

Robert B. Furlong
Department of Geology, Wayne State University, Detroit, Michigan
* Based upon a dissertation submitted in partial fulfillment of the requirements for the doctoral degree at the University of Illinois.

Abstract: Transmission and diffraction electron micrographs were made of illite and montmorillonite to study the changes that take place as the clays were heated continuously to 1200°C.

In both of the clay minerals studied, expulsion of a highly fluid material occurred subsequent to dehydroxylation and prior to the development of the first-formed high temperature phases. It was hypothesized that this material represented the expulsion of constituents in the clay in excess of those needed for the formation of the first high-temperature phase. Electron diffraction indicates that the high-temperature phases that formed all developed with some preferential orientation, and were strongly influenced in their development by the structure of the original clay.

Clays and Clay Minerals; 1967 v. 15; no. 1; p. 87-101; DOI: 10.1346/CCMN.1967.0150110
© 1967, The Clay Minerals Society
Clay Minerals Society (www.clays.org)