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Characterizing the degradation of [(UO2F2)(H2O)](7) 4H(2)O under humid conditions

机译:在潮湿条件下表征[(UO 2 F 2)(H 2 O)](7)4H(2)o的降解

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摘要

Under humid conditions, uranyl fluoride ([(UO2F2)(H2O)](7)center dot 4H(2)O) undergoes a loss of fluorine to form a uranyl hydroxide species, which can be further hydrated to form a uranyl peroxide species. X-ray diffraction data of the uranyl peroxide product is presented for the first time. In addition, the temperature and humidity conditions under which these reactions occur have been clarified by a 220-day experiment using microRaman spectroscopy to track chemical changes in individual particles of uranyl fluoride. At 25 and 35 degrees C, uranyl fluoride is found to be stable at 32% relative humidity but not stable at and above 59% relative humidity. We show that water vapor pressure is the driving factor in formation of both the hydroxide and peroxide products. The kinetics of the transformation from uranyl fluoride into uranyl hydroxide is consistent with a denucleation reaction following the absorption of water molecules. (C) 2019 The Authors. Published by Elsevier B.V.
机译:在潮湿的条件下,氟烷基([(UO 2 F 2)(H 2 O)](7)中心点4h(2))经历氟损失以形成氢氧化铀酰物质,其可以进一步水合以形成过氧化铀酰物质。 首次介绍过氧化铀酰产物的X射线衍射数据。 此外,通过使用微扫描光谱的220天的实验阐明了这些反应的温度和湿度条件,以跟踪氟烷氟亚烷氟烷基的各个颗粒中的化学变化。 在25℃和35℃下,发现氟烷基氟化物在32%相对湿度下稳定,但在59%相对湿度的高于和高于59%的情况下稳定。 我们表明水蒸气压力是形成氢氧化物和过氧化物产物的驱动因子。 从氟烷氧化物到氢氧化铀中的转化的动力学与水分子吸收后的Denucreation反应一致。 (c)2019年作者。 由elsevier b.v出版。

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