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Thermal decomposition of the natural hydrotalcites carrboydite and hydrohonessite

Frost, Ray L., Weier, Matt L., Clissold, Meagan E., Williams, Peter A., & Kloprogge, J. Theo (2003) Thermal decomposition of the natural hydrotalcites carrboydite and hydrohonessite. Thermochimica Acta, 407(1-2), pp. 1-9.

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Abstract

A combination of high resolution thermogravimetric analysis coupled to a gas evolution mass spectrometer combined with infrared emission spectroscopy has been used to study the thermal decomposition of two Australian hydrotalcites carrboydite (Ni6Al2(SO4,CO3)(OH)16.4H2O) and hydrohonessite (Ni6Fe2(SO4,CO3)(OH)16.7H2O). High resolution thermal analysis shows the decomposition takes place in 5 steps. Each step is related to the loss of water, hydroxyl units, carbonate and sulphate. Infrared emission spectroscopy clearly identifies the presence of these molecular species and the temperature at which they are lost. Minor amounts of carbonate are observed in the minerals. Water is in two states in the structure, namely weakly hydrogen bonded and strongly hydrogen bonded. The symmetry of the sulphate anion is reduced through this hydrogen bonding.

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ID Code: 948
Item Type: Journal Article
Keywords: dehydration, dehydroxylation, hydrotalcite, infrared emission spectroscopy, high, resolution thermogravimetric analysis
DOI: 10.1016/S0040-6031(03)00262-4
ISSN: 0040-6031
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 2003 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 01 Apr 2005
Last Modified: 29 Feb 2012 23:00

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