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The development of crystalline structure in aluminium hydroxide polymorphs on ageing

Published online by Cambridge University Press:  05 July 2018

H. Elderfield  and
J. D. Hem
H. Elderfield
Affiliation:
Department of Earth Sciences, The University of Leeds, Leeds, LS2 9JT
J. D. Hem
Affiliation:
U.S. Geological Survey, Menlo Park, California 94025
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Summary

Infrared absorption spectra of the precipitated solids separated from aluminium-hydroxide solutions below the pH of minimum solubility of Al(OH)3 demonstrate the slow ageing of polymeric Al complexes to gibbsite. On comparison with the spectra of natural gibbsites, shifts in absorption frequency during crystal growth are interpreted in terms of changes in hydrogen bonding as a consequence of deprotonation and stacking of aluminium hydroxide layers to form gibbsite. In alkaline solutions the bayerite polymorph precipitates and IR frequencies are compatible with protonation as aluminate ions associate with the bayerite crystal having a lower crystal energy than its low pH polymorph. The infrared spectrum of nordstrandite, which is probably the stable polymorph in alkaline solution, shows evidence of strongly polarized hydroxyl ions similar to gibbsite.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 301 , March 1973 , pp. 89 - 96
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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