Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4995936 | Thermochimica Acta | 2017 | 10 Pages |
Abstract
Thorium uranium oxide powder with uranium concentrations 10, 20, 30, 40, 50 and 70Â mol% was prepared by gel combustion method. The sintering behaviour of the powders studied by dilatometry indicated that samples containing uranium up to 30Â mol% had similar shrinkage behaviour with single step sintering. However, samples containing 40, 50 and 70% uranium followed two step sintering process. Though the air calcined powder shows two phase system beyond 30% uranium containing samples, sintering results into single phase system for samples containing up to 50% of uranium. The temperature programmed reduction-oxidation experiments showed that compositions containing up to 50-mol% of uranium show single reducible species throughout the temperature range. X-ray photoelectron spectroscopic studies of these sintered pellets showed presence of uranium in 6+ and 4+ oxidation states in these oxides. The experimentally determined heat capacities of solid solutions were found to have higher values than that of computed using Neumann-Kopp's molar additivity rule.
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Authors
Rajesh V. Pai, Manjulata Sahu, M.R. Pai, Dheeraj Jain, Jagannath Jagannath, S.K. Mukerjee,