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首页> 外文期刊>Journal of Materials Science >Preparation, characterization and thermal stability of tellurites and tellurates of uranium
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Preparation, characterization and thermal stability of tellurites and tellurates of uranium

机译：碲酸盐和铀碲酸盐的制备，表征和热稳定性

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摘要

Uranium tellurates, UTeO_(5) and UTe_(3)O_(9) were prepared by heating UO_(2)+TeO_(2) and U_(3)O_(8)+TeO_(2) in air/oxygen and the tellurite UTe_(3)O_(8) by heating UO_(2)+TeO_(2) in vacuum sealed quartz ampoule. The compounds were characterized by X-ray diffraction (XRD) and thermogravimetry (TG). A new tellurite compound UTeO_(4) was synthesized. Their thermal stability was determined in oxygen, argon and argon-8%hydrogen in the temperature range of ambient temperature to 950℃. UTeO_(5) and UTe_(3)O_(9) are stable in flowing oxygen up to 925 and 750℃, respectively under dynamic heating at 10 K/min. UTe_(3)O_(9) decomposes in O_(2)/Ar/Ar-8%H_(2) via formation of UTeO_(5), whereas UTe_(3)O_(8) decomposes in Ar-8%H_(2) via formation of UTeO_(4). UTe_(3)O_(9) decomposes at 560℃ but all the other compounds decompose at 460℃ in Ar-8%H_(2).
机译：通过在空气/氧气和亚碲酸盐中加热UO_（2）+ TeO_（2）和U_（3）O_（8）+ TeO_（2）制备碲酸铀酸盐UTeO_（5）和UTe_（3）O_（9）。通过在真空密封的石英安瓿瓶中加热UO_（2）+ TeO_（2），来生成UTe_（3）O_（8）。通过X射线衍射（XRD）和热重分析（TG）表征化合物。合成了一种新的亚碲酸盐化合物UTeO_（4）。在环境温度至950℃的温度范围内，在氧气，氩气和8％氩气中测定了它们的热稳定性。在动态加热速度为10 K / min的情况下，UTeO_（5）和UTe_（3）O_（9）分别在高达925和750℃的流动氧气中稳定。 UTe_（3）O_（9）通过形成UTeO_（5）在O_（2）/ Ar / Ar-8％H_（2）中分解，而UTe_（3）O_（8）在Ar-8％H_（ 2）通过形成UTeO_（4）。在Ar-8％H_（2）中，UTe_（3）O_（9）在560℃分解，而所有其他化合物在460℃分解。

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