Dissociation Pressure of Uranium Dicarbide
Vapor transport of uranium from UC1.86 in a graphite crucible was measured from 1930 to 2365 deg K by the Knudsen technique. In order to treat the data, unusual assumptions were made concerning the thermal properties of carbides which hydrolyze to yield hydrocarbons. The gaseous uranium species is assumed to be monatomic. With the aid of these assumptions, the data were treated by the third-law as well as by the second-law method. Agreement between the two is considered good, and the DELTA H298 deg obtained for the process UC1.86(s) = U(g) + 1.86 C (graphite) is 140.15 plus or minus 1.82 kcal/mole. Reasonable estimations for reaction entropies within the system lead to an upper limit of 0.5 kcal/mole for DELTA H298 deg for the reaction UC(s) + 0.86 C (graphite) = UC1.86(s), and hence a value of 119.8 plus or minus 2.8 kcal/ mole is obtained as an upper limit for DELTA H298 deg of vaporization of uranium.
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-016352
- OSTI ID:
- 4782334
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 6 Vol. 36; ISSN JCPSA6; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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