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- W59633217 abstract "S>Exchange of U between beta UF/sub 5/ and gaseous UF/sub 6/ has been studied in the temperature range 80 to 140 deg C. Series experiments, consisting of exposure of a sample of enriched (17.98 wt.% U/sup 235/) UF/sub 5/ to several successive samples of normal UF/sub 6/, as well as one-exposure experiments have been performed. The decrease in first order rate constants, indicates that neither chemical reaction at the gassolid interface nor diffusion of UF/sub 6/ through an adsorbed gas layer controls the rate of exchange of U between gas and solid. Exchange rates are compatible with a process controlled by diffusion of U in and through the solid. Estimates of the diffusion coefficient vary from 0.3 to 11 x 10/sup -14/ sq. cm/hr (on the basis of N/sub 2/ surface areas and the assumption of uniform particle size). The effect of temperature is poorly defined by the present data, being equivalent to an activation energy for diffusion of 7.3 plus or minus 12.5 kcal/mole. Cver the temperature range 80 to 140 deg C the average value of the diffusion coefficient is 2.6 x 10/sup -14/ sq. cm/hr. (auth)" @default.
- W59633217 created "2016-06-24" @default.
- W59633217 creator A5024903994 @default.
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- W59633217 date "1951-07-13" @default.
- W59633217 modified "2023-09-24" @default.
- W59633217 title "EXCHANGE OF URANIUM BETWEEN BETA URANIUM PENTAFLUORIDE AND GASEOUS URANIUM HEXAFLUORIDE" @default.
- W59633217 doi "https://doi.org/10.2172/4343973" @default.
- W59633217 hasPublicationYear "1951" @default.
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