Some studies of the oxidation of uranium dioxide
| Autor: | K.T. Harrison, K.T. Scott |
|---|---|
| Rok vydání: | 1963 |
| Předmět: |
Nuclear and High Energy Physics
Single stage Chemistry Inorganic chemistry Uranium dioxide Analytical chemistry Activation energy Thermogravimetry Tetragonal crystal system chemistry.chemical_compound Qualitative analysis Nuclear Energy and Engineering Phase (matter) General Materials Science Phase diagram |
| Zdroj: | Journal of Nuclear Materials. 8:307-319 |
| ISSN: | 0022-3115 |
| Popis: | The use of a new automatically recording microbalance and its application to thermogravimetry are described. This technique is applied to the investigation of the oxidation of various uranium dioxide preparations in air at temperatures up to 800 deg C. Under conditions of linearly increasing temperature, fine uranium dioxide powders are shown to oxidise in a characteristic two-step process first to a tetragonal phase of composition UO/sub 2.35 plus or minus 0.02/ and then to U/sub 3/O/sub 8/. An activation energy of 19.1 kcal is derived for the UO/sub 2/ yields U/sub 3/O/sub 7/'' oxidation. Uranium dioxide of low surface area exhibits oniy a single stage oxidation from UO/sub 2/ yields U/sub 3/O/sub 8/. Initiation of reactions and oxidation rates are found to be proportional to the heating rate. (auth) |
| Databáze: | OpenAIRE |
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