Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-24T04:31:51.490Z Has data issue: false hasContentIssue false
  • English
  • Français

Electron Optical Study of the Thermal Decomposition of Kaolinite

Published online by Cambridge University Press:  09 July 2018

J. D. C. McConnell  and
S. G. Fleet
J. D. C. McConnell
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
S. G. Fleet
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
Get access Rights & Permissions [Opens in a new window]

Abstract

The electron microscope has been used to study the mechanisms of thermal decomposition of kaolinite in the temperature range 800-1350°C. Three main reaction mechanisms appear to be important in this temperature range. At 850°C metakaolinite breaks down to produce an amorphous defect oxide phase which is homogeneous and finely porous. When heated at 900°C the reaction product is a defect spinel with strongly preferred orientation and microporous structure. This defect spinel phase is observed in the temperature range 900-1150°C and shows little change in microstructure throughout this temperature range where the secondary development of muUite also occurs to a limited extent. Above 1150°C mullite develops in quantity and appears to represent the bulk of the reaction product at 1200°C.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 3 , July 1970 , pp. 279 - 290
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Brindley, G.W. & Nakahira, M. (1958) Nature 181, 1333.Google Scholar
Brindley, G.W. & Nakahira, M. (1959) J. Am. Ceram. Soc. 42, I, 311; II, 314; III, 319.Google Scholar
Comer, J.J. (1961) J. Am. Ceram. Soc. 44, 561.CrossRefGoogle Scholar
Fyfe, W.S., Turner, F.J. & Verhoogen, J. (1958) Geol. Soc. Am. Memoir 73, 90.Google Scholar
Glasstone, S., Laidler, K.J. & Eyring, H. (1941) The Theory of Rate Processes, p. 442. McGraw Hill, New York.Google Scholar
Huckel, W. (1951) Structural Chemistry of lnorganic Compounds, II, (Trans. Long, L. H.) Elsevier.Google Scholar
Lippens, B.C. (1961) Structure and Texture of Aluminas, Thesis, Delft.Google Scholar
Lippens, B.C. & De Boer, J.H. (1964) Acta. Cryst. 17, 1312.CrossRefGoogle Scholar
McConnell, J.D.C. (1967a) in Physical Methods in Determinative Mineralogy, p. 335. Academic Press, London.Google Scholar
McConnell, J.D.C. (1967b) Cambridge Research 3, 15.Google Scholar
Mckie, D. & McConnell, J.D.C. (1963) Mineralog. Mag. 33, 581.Google Scholar
Ratcliffe, J.A. (1956) Reports on Progress in Physics 19, 188.CrossRefGoogle Scholar
Roy, R., Roy, D.M. & Francls, E.E. (1955)J. Am. Ceram. Soc. 38, 198.Google Scholar