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AcknowledgmentThe authors gratefully acknowledge the capable assistance of Miss Agnes Forster ( x -r a y diffraction) and Mr. T. R. McKinney (electron diffraction) of the General Motors Research Laboratories, and the encouragement and active participation in m a n y aspects of this w o r k provided by personnel of the Delco Radio

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%) . . UC + 0 . 1 w t % Ni 0.127 5 MOz-,t 0.083 8 90 W t % M(Oo.34C0.66) + 10 W t % MOz uoz 0.064 2 0.036 2 -* Uncorrected for porosity. t M = (Uo.sPua.i). relations plotted by McAdams" for a semi-infinite solid. I n UC and UOz, thermal conductivities were calculated using reported heat capacity values16 of 0.048 cal/g-OC and 0.060respectively. An assumed value of 0.048 cal/g-OC was used for the monoxide-type materials because of the similarity of their molecular structures with that of carbide.The calculated values presented in Table V show that the monoxide-type compositions have higher room-temperature conductivities than those of (U,PU)OZ and UO,. Although the absolute values for UC and UO, are lower than expected, the relative values are reasonably good. These data, therefore, are believed to be useful for qualitative comparison.

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