Thermal decomposition of metatorbernite - A controlled rate thermal analysis study
Frost, Ray L., Kristof, Janos, Weier, Matt L., Martens, Wayde N., & Horvath, Erzsebet (2005) Thermal decomposition of metatorbernite - A controlled rate thermal analysis study. Journal of Thermal Analysis and Calorimetry, 79(3), pp. 721-725.
The mineral metatorbernite, Cu[(UO2)2(PO4)]2•8H2O, has been studied using a combination of energy dispersive X-ray analysis, X-ray diffraction, dynamic and controlled rate thermal analysis techniques. X-ray diffraction shows that the starting material in the thermal decomposition is metatorbernite and the product of the thermal treatment is copper uranyl phosphate. Three steps are observed for the dehydration of metatorbernite. These occur at 138 degrees Celsius with the loss of 1.5 moles of water, 155 degrees Celsius with the loss of 4.5 moles of water, 291 degrees Celsius with the loss of an additional 2 moles of water. These mass losses result in the formation of four phases namely meta(II)torbernite, meta(III)torbernite, meta(IV)torbernite and anhydrous hydrogen uranium copper pyrophosphate. The use of a combination of dynamic and controlled rate thermal analysis techniques enabled a definitive study of the thermal decomposition of metatorbernite. While the temperature ranges and the mass losses vary from author to author due to the different experimental conditions, the results of the CRTA analysis should be considered as standard data due to the quasi-equilibrium nature of the thermal decomposition process.
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|Item Type:||Journal Article|
|Keywords:||autunite, torbernite, metatorbernite, dehydration, controlled rate thermal 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 2005 Springer|
|Copyright Statement:||The original publication is available at SpringerLink http://www.springerlink.com|
|Deposited On:||09 Dec 2005|
|Last Modified:||11 Aug 2011 01:18|
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