Isotherms for the uranium-hydrogen system at temperatures of 700 to 10650C and pressures to 137.89 MPa

Pressure vs composition (P-C) isotherms for the UH system for temperatuers of 700 to 10650C and pressures to 137.89 MPa are shown. The sample was contained in a vessel concentric and located within a secondary vessel. Plateau pressure at 10650C is 700 atm. The single-phase region on the hydrogen-rich side starts at a H/U ratio of 2.35. Physical property measurements showed a thermal conductivity, k, value of 0.003 cal/cm sec K, R/sub c/ = 50. Experimentally determined plateau pressures are compared with values obtained by other workers. The UH system retains broad, two-phase plateaus at temperatures to 10650C. The critical temperature must be above 10650C. 13 refs., 3 figs., 1 tab