The kinetics and mechanism of the uranium-water vapour reaction — an evaluation of some published work |
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Authors: | A G Ritchie |
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Affiliation: | Building B8A, AWRE, Aldermaston, Reading, Berkshire, United Kingdom |
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Abstract: | The published results of Grimes and Morris on the rate of the uranium-water vapour reaction which were obtained using interferometry have been recalculated using the best values derived from the literature for the complex refractive indices of uranium and uranium dioxide (3.1–3.91 for uranium and 2.2-0.51 for uranium dioxide). The kinetics have been described by Haycock's model and the linear rate constant is given by K1 = 1.3 × 104P1/2H2O exp( − 9.0 kcal/RT )mg U/cm2 h, where PH2O is the water vapour pressure in torr or K1 = 3.48 × 108r1/2 exp( −14.1 kcal/RT)mg U/cm2 h, where r is the fractional relative humidity, R is the gas constant and T is the absolute temperature. A mechanism is described which accounts for the observed dependence of the rate of uranium-water vapour reaction on the square root of the water vapour pressure. |
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