Thermal decomposition of liebigite : a high resolution thermogravimetric and hot-stage Raman spectroscopic study
Frost, Ray L., Weier, Matt L., & Martens, Wayde N. (2005) Thermal decomposition of liebigite : a high resolution thermogravimetric and hot-stage Raman spectroscopic study. Journal of Thermal Analysis and Calorimetry, 82(2), pp. 373-381.
A combination of high resolution thermogravimetric analysis coupled to a gas evolution mass spectrometer has been used to study the thermal decomposition of liebigite. Water is lost in two steps at 44 and 302°C. Two mass loss steps are observed for carbon dioxide evolution at 456 and 686°C. The product of the thermal decomposition was found to be a mixture of CaUO4 and Ca3UO6. The thermal decomposition of liebigite was followed by hot-stage Raman spectroscopy. Two Raman bands are observed in the 50°C spectrum at 3504 and 3318 cm-1 and shift to higher wavenumbers upon thermal treatment; no intensity remains in the bands above 300°C. Three bands assigned to the υ1 symmetric stretching modes of the (CO3)2- units are observed at 1094, 1087 and 1075 cm-1 in agreement with three structurally distinct (CO3)2- units. At 100°C, two bands are found at 1089 and 1078 cm-1. Thermogravimetric analysis is undertaken as dynamic experiment with a constant heating rate whereas the hot-stage Raman spectroscopic experiment occurs as a staged experiment. Hot stage Raman spectroscopy supports the changes in molecular structure of liebigite during the proposed stages of thermal decomposition as observed in the TG-MS experiment.
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|Item Type:||Journal Article|
|Keywords:||Andersonite, Dehydration, Dehydroxylation, High-Resolution Thermogravimetric analysis, Liebigite, Rutherfordine, Raman Spectroscopy|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Akademiai Kiado (Springer)|
|Copyright Statement:||The original publication is available at SpringerLink http://www.springerlink.com|
|Deposited On:||17 Jun 2009 23:20|
|Last Modified:||01 Mar 2012 10:12|
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