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Morphological Control of Ca3Al2(OH)12

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Open access
Authors
Fogg, A.
Freij, Amal
Oliveira, Allan
Rohl, Andrew
Ogden, Mark
Parkinson, Gordon
Date
2002
Type
Journal Article

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Fogg, Andrew M and Freij, Amal J and Oliveira, Allan and Rohl, Andrew L and Ogden, Mark I and Parkinson, Gordon M. 2002. Morphological Control of Ca3Al2(OH)12. Journal of Crystal Growth 234 (1): 255-262.
Source Title
Journal of Crystal Growth
DOI
Faculty
A.J. Parker Cooperative Research Centre for Hydrometallurgy
Division of Engineering, Science and Computing
Faculty of Science
School
Applied Chemistry
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Copyright 2002 Elsevier B.V. All rights reserved

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Abstract

The effect of a range of inorganic and organic crystal growth modifiers on the morphology of Ca3Al2(OH)12 has been studied. It has been found that some additives show a strong preference for a single crystal face forming polyhedral crystals whilst others are less selective, producing crystals with a less well defined morphology. In this way sulphite and dithionite preferentially interact with the {111} face producing octahedral crystals and nitrilotriacetic acid stabilises the {110} face forming rhombic dodecahedral crystals. Phosphate, however, leads to the formation of small needle-like crystals and the organic acids, N(CH2CO2H)2(CH2PO3H2), N(CH2CO2H)(CH2PO3H2)2, HN(CH2PO3H2)2, and H3CN(CH2PO3H2)2, produce near spherical crystals.