Abstract
Abstract The resistivity dependence of as-cast and annealed UC on temperature (77–300 K) as well as the C U ratio have been investigated experimentally. Additionally, lattice constants of UC have been measured in its nonstoichiometric regions. Estimated values of the electrical resistivity of stoichiometric UC (annealed at 1500°C for 3 h) were (10 ± 2) μΩ · cm at liquid-nitrogen temperature and (34 ± 3) μΩ · cm at room temperature, and the value of the lattice constant was (4.958 ± 0.001) A at room temperature. It was also estimated that 1 at% of carbon vacancies in UC1−x and oversaturated carbon interstitials in UC1+x result in resistivity increases of (12 ± 2) μΩ · cm and 6 μΩ · cm, respectively. A very narrow nonstoichiometric region was observed in UC at 1500°C. It might lie between UC0.98 and UC1.01
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