Thermogravimetric study of uranium phosphates |
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| Authors: | J. M. Schaekers |
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| Affiliation: | 1. Physical Metallurgy Division, Atomic Energy Board, Pretoria, South Africa
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| Abstract: | The thermal decomposition of (UO2)3(PO4)2 and U(HPO4)2 ·xH2O in the temperature range 25–1600?, was investigated. (UO2)3(PO4)2 decomposed first to 1/3[U3O8 + 3U2O3P2O7] and then to U3O5P2O7 before a loss of phosphorus was observed above 1350?. Decomposition in air and in inert atmospheres was nearly identical. Reduction with H2 or with carbon black in argon gave U3O5P2O7 and [UO2 + + (UO)2P2O7] before pure UO2 was formed. U(HPO4)2 ·xH2O decomposed to UP2O7 in argon. It oxidized partly in air before the same product was obtained. The high temperature stability of UP2O7 and U3(PO4)4 was also investigated. |
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