Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-26T09:55:19.710Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermal Transformations of Pyrophyllite and Talc as Revealed by X-Ray and Electron Diffraction Studies

Published online by Cambridge University Press:  01 January 2024

M. Nakahira  and
T. Kato
M. Nakahira
Affiliation:
Pennsylvania State University, University Park, Pa., USA University of Tokyo, Hongo, Tokyo, Japan
T. Kato
Affiliation:
Pennsylvania State University, University Park, Pa., USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Single crystal X-ray and electron diffraction studies were carried out to examine the thermal transformation sequences of pyrophyllite and talc, respectively. The results showed that both minerals transformed topotactically. No dehydroxylated talc phase was observed, while an anhydride of pyrophyllite was obtained at about 900°C. The presence of a distorted anhydride lattice of pyrophyllite tends to indicate a homogeneous mechanism for the dehydroxylation of pyrophyllite. In contrast, the diffraction features of heated talc together with the cell volume relationship between talc and enstatite suggest an inhomogeneous mechanism for this reaction.

Type
Symposium on High Temperature Transformations
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 12 , February 1963 , pp. 21 - 27
Copyright
Copyright © The Clay Minerals Society 1963

Footnotes

Contribution No. 63-53, College of Mineral Industries, The Pennsylvania State University, University Park, Pennsylvania.

References

Bradley, W. F. and Grim, R. E. (1951) High temperature thermal effects of clay and related minerals: Amer. Miner., v. 36, pp. 182–201.Google Scholar
Taylor, H. F. W. (1962) Homogeneous and inhomogeneous mechanisms in the dehydroxylation of minerals: Clay Min. Bull., v. 5, pp. 45–55.CrossRefGoogle Scholar
Brindley, G. W. (1961) The role of crystal structure in the dehydration reactions of some layer-type minerals: J. Min. Soc. Japan, v. 5, pp. 217–237.Google Scholar
Heller, L., Farmer, V. C., Mackenzie, R. C., Mitchell, B. D. and Taylor, H. F. W. (1962) The dehydroxylation and rehydroxylation of triphormic dioctahedral clay minerals: Clay Min. Bull., v. 5, pp. 56–72.Google Scholar
Stubican, V. and Roy, R. (1962) Proton retention in heated 1: 1 clays studied by infrared spectroscopy, weight loss and deuterium uptake: J. Phys. Chem., v. 65, pp. 1348–1351.Google Scholar