An induction transformer furnace for a neutron diffractometer is described. This furnace has been used for the examination of refractory carbides by neutron diffraction at temperatures up to 2500°C.
Vapor transport of uranium from UC1.86 in a graphite crucible has been measured from 1930° to 2365°K by the Knudsen technique. In order to treat the data, unusual assumptions have been 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 have been treated by the third-law method as well as by the second-law method. Agreement between the two is considered good, and the ΔH298° obtained for the process UC1.86(s)=U(g)+1.86 C (graphite)is 140.15±1.82 kcal/mole. Reasonable estimations for reaction entropies within the system lead to an upper limit of 0.5 kcal/mole for ΔH298° for the reactionUC(s)+0.86 C (graphite)=UC1.86(s),and hence a value of 119.8±2.8 kcal/mole is obtained as an upper limit for ΔH298° of vaporization of uranium.
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