Heat capacities at high temperatures of uranium, uranium trichloride, and uranium tetrachloride

Abstract

The enthalpies referred to 0° C of uranium in the range 0° to 900° C, of uranium t richlo-ride in the range 0° to 725° C, and of uranium tetrachloride in the range 0° to 425° C, have been determined usin g the "drop" method with an ice calorimeter. Derived values of entropy referred to 0° C and specific heat are given. The samples were of high purity. Two first-order transformations of uranium were observed and the heats of transition calculated from the experimental data. No evidence of first-or second-order transitions in the chlorides was found.