Thermal decomposition of agardites (REE) –relationship between dehydroxylation temperature and electronegativity

Frost, Ray L., Erickson, Kristy L., Weier, Matt L., McKinnon, Adam R., Williams, Peter A., & Leverett, Peter (2005) Thermal decomposition of agardites (REE) –relationship between dehydroxylation temperature and electronegativity. Thermochimica Acta, 427(1-2), pp. 167-170.

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The thermal decomposition of a suite of synthetic agardites of formula ACu6(AsO4)2(OH)6.3H2O where A is given by a rare earth element has been studied using thermogravimetric analysis techniques. Dehydration of the agardites occurs at low temperatures and over an extended temperature range from ambient to around 60 degrees Celsius. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3 moles of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456 degrees Celsius. The mass loss during dehydroxylation shows the number of moles of hydroxyl units is six. There is a linear relationship between the first dehydroxylation temperature and the electronegativity of the REE.

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12 citations in Scopus
11 citations in Web of Science®
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417 since deposited on 14 Feb 2006
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ID Code: 3547
Item Type: Journal Article
Refereed: Yes
Keywords: agardite, goudeyite, mixite, petersite, thermal analysis, mass spectrometry, electronegativity
DOI: 10.1016/j.tca.2004.09.007
ISSN: 0040-6031
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 14 Feb 2006 00:00
Last Modified: 29 Feb 2012 13:15

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