Mixing enthalpies in samarium–transition metal melts

Abstract

The mixing enthalpies in homogeneous melts of samarium with transition metals (Cr, Mn, Fe, Co, Ni) are measured by high-temperature calorimetry over the entire concentration range (in the Sm−Cr system up to 10 at.% Cr). The mixing enthalpies gradually change from positive (Sm−Cr system) to sign-variable (Sm−Mn system) and finally to negative (Sm−Fe, Sm−Co, and Sm−Ni systems). The extreme values of the integral enthalpy are (kJ/mole): 0.96 ± 0.17 and −0.69 ± 0.19 (Sm–Mn, 1600 K); −4.20 ± 0.93 (Sm–Fe, 1829 K); −14.63 ± 1.91 (Sm–Co, 1829 K); and −34.62 ± ± 1.73 (Sm−Ni, 1780 K).