Thermodynamics of uranium intermetallic compounds I. Heat capacities of URu3 and URh3 from 5 to 850 K

Heat capacities of carefully characterized samples of URu3 and URh3 were measured by adiabatic calorimetry from 5 to 350 K by adiabatic calorimetry and from 300 to 850 K by enthalpy-increment drop calorimetry. Values for the thermodynamic properties at 298.15 K; Cp,m/R, Smo/R, {Hmo(T)-Hmo}(0)/R, and -{Gmo(T)-Hmo(0)}/R are: URu3: 12.20, 17.38, 2550 K, and 8.82 K; URh3: 12.39, 18.31, 2639 K, and 9.46 K. Phase transitions were not observed over the entire temperature range. In contrast with UPd3 with localized spins and with related materials showing localized spin fluctuations, the electronic coefficients show typical metallic behavior.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25929/1/0000492.pd