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The dehydration of gibbsite and the structure of a tetragonal γ—Al2O3

Published online by Cambridge University Press:  14 March 2018

H. Saalfeld
H. Saalfeld*
Affiliation:
Max Planck Institut fuer Silikatforschung, Würzburg, Germany
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Abstract

Single crystals of gibbsite were partially dehydrated to boehmite in a hydrothermal atmosphere. Most of the boehmite crystallites show preferred orientation that can be explained by the octahedral linkage. Further heating in air leads to a tetragonal γ-Al2O3 whose crystallites also are oriented. The orientations give information about structural details. At about 900°C a transformation γ→θ-Al2O3 takes place. In this case too the crystallites are oriented. The oxygen chains lying parallel to the a-axis of gibbsite are strongly bound and are taken over in every new lattice during transformation.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 3 , Issue 19 , August 1958 , pp. 249 - 257
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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