Thermal decomposition of synthetic hydrotalcites reevesite and pyroaurite
A combination of high resolution thermogravimetric analysis coupled to a gas evolution mass spectrometer has been used to study the thermal decomposition of synthetic hydrotalcites reevesite (Ni6Fe2(CO3)(OH)16.4H2O) and pyroaurite (Mg6Fe2(CO3)(OH)16.4H2O) and the cationic mixtures of the two minerals. XRD patterns show the hydrotalcites are layered structures with interspacing distances of around 8.0 Å. A linear relationship is observed for the d(001) spacing as Ni is replaced by Mg in the progression from reevesite to pyroaurite. The significance of this result means the interlayer spacing in these hydrotalcites is cation dependent. High resolution thermal analysis shows the decomposition takes place in 3 steps. A mechanism for the thermal decomposition is proposed based upon the loss of water, hydroxyl units, oxygen and sulphur dioxide.
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|Item Type:||Journal Article|
|Keywords:||dehydration, dehydroxylation, hydrotalcite, reevesite, pyroaurite, highresolution thermogravimetric analysis|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2004 Springer|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher. The original publication is available at SpringerLink.|
|Deposited On:||11 Oct 2005|
|Last Modified:||29 Feb 2012 23:08|
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