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

The enthalpy of mixing for liquid binary alloys of lanthanum with 3d-transition metals (Sc, Ti, V, Cr, and Fe) is determined by a calorimetric method within the field of compositions rich in lanthanum. Data for the partial enthalpy of mixing in the La − 3d-metal system with infinite dilution demonstrates a complex relationship of a change in it in the series of 3d-metals connected with gradual filling of the 3d-zone due to alloy formation with lanthanum.

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