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

The thermal decomposition of a suite of synthetic agardites of formula ACu 6(AsO 4) 2(OH) 6·3H 2O 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...

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Bibliographic Details
Published in:Thermochimica acta 2005-03, Vol.427 (1), p.167-170
Main Authors: Frost, Ray L., Erickson, Kristy L., Weier, Matt L., McKinnon, Adam R., Williams, Peter A., Leverett, Peter
Format: Article
Language:English
Subjects:
Agardite
Chemistry
Electronegativity
Exact sciences and technology
Goudeyite
Inorganic chemistry and origins of life
Mass spectrometry
Miscellaneous
Mixite
Petersite
Preparations and properties
Thermal analysis
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Summary:The thermal decomposition of a suite of synthetic agardites of formula ACu 6(AsO 4) 2(OH) 6·3H 2O 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 °C. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3 mol of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456 °C. 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 agardites (REE).
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2004.09.007