Heat Capacity of Alpha Uranium from 1.7 to 25°K

The heat capacity of high-purity alpha uranium has been determined from 1.7 to 23°K and smoothed into previous data at 25°K. These heat capacities are significantly lower than the values reported by other investigators. The values for $\gamma$, the coefficient of the electronic contribution to heat capacity, and for the Debye $\Theta$ at 0°K, were determined to be 9.88±0.05 mJ ${\mathrm{deg}}^{-2\mathrm{}}$ ${\mathrm{}(\mathrm{g}\mathrm{at}.\mathrm{})\mathrm{}}^{-1\mathrm{}}$ and 222±2°K, respectively. The $C_p-C_v$ correction was evaluated between 15 and 80°K to show the effect of the anomalous expansive and compressive behavior of uranium between 20 and 45°K on the lattice heat capacity. Tabular values of $C_p$, $C_v$, $\Theta$, and other thermodynamic quantities are presented up to 25°K.