Structural changes in UO2(hfa)2 NH3 near the melting point |
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| Authors: | DA Johnson JC Taylor AB Waugh |
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| Institution: | Energy Chemistry Division, CSIRO, Lucas Heights Research Laboratories, Private Mail Bag 7, Sutherland, NSW, 2232, Australia |
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| Abstract: | A reversible colour change from lemon-yellow to orange was observed for polycrystalline UO2(hfa)2 NH3 at 100°C (hfa = (1,1,1,5,5,5-hexafluoro-2,4-pentanedione)). The changes in the X-ray powder pattern between ?196° and 130°C were followed with a Guinier-Simon focussing camera. The colour change was not due to an α ? β type structural transition as found earlier in α and β- UO2(hfa)2 tmp (tmp = trimethyl phosphate), but was considered to be due to changes in the hydrogen bonding of the ammonia molecules. |
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