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The kinetics of the ordering process in triclinic NaAlSi3O8

Published online by Cambridge University Press:  14 March 2018

J. D. C. McConnell  and
Duncan McKie
J. D. C. McConnell
Affiliation:
Dept. of Mineralogy and Petrology, Downing Place, Cambridge
Duncan McKie
Affiliation:
Dept. of Mineralogy and Petrology, Downing Place, Cambridge
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Summary

A kinetic analysis is presented of the data of MacKenzie (1957) on the hydrothermal treatment of NaAlSi3O8 under isobaric, isothermal conditions in the temperature range 450° C. to 1000° C.

The analysis indicates the existence of a smeared polymorphic transformation in the temperature range around 600° C. The activation energy for the transformation is about 60 kcal. mole−1 and has been equated with the process of self-diffusion involved in Al-Si ordering in the structure. Some dry-heating experiments and the influence of varying water vapour pressure are discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 249 , June 1960 , pp. 436 - 454
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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