Abstract-The oxidation of uranium tetrachloride was investigated by thermo-analytical and X-ray diffraction methods. It proceeds in the presence of oxygen at atmospheric pressure via uranyl chloride (UO.CI.) as an intermediate product:The conversion at the surface of the crystal initially sets the rate. The activation energy and the frequency factor of the surface reaction were calculated. After a coat of reaction products has grown the diffusion of oxygen through the interface controls the continued oxidation process. The thermal decomposition of uranyl chloride becomes noticeable from 400°C on, accelerating the reaction at reduced pressure and causes a change in the kinetics.
Abstract-The oxidation of uranylchloridewas investigated by thermoanalytical and X-ray diffraction methods. U0 2 CI 2 reacts with oxygen according to 3U0 2 CI 2 +0 2 ....,. U 3 0 8 +3CI 2 • The surface reaction controls the rate. The activation energy and the frequency factor of the reaction were calculated.
Die Verbindung kristallisiert monoklin, Raumgruppe P 21 /a, rnit a = 22,11, b = 14,96, c = 10,93 A, p = 108,6" u n d 4 Molekulen in der Elementarzelle. Die Strukturbestimmung basiert auf 3500 Reflexdaten, die niit einem automatischen Diffrak-
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