Add time:08/10/2019         Source:sciencedirect.com

The standard enthalpies of formation of some samarium alloys in the binary systems SmX (where X = C, Si, Ge, Sn) have been determined by direct synthesis calorimetry at 1273±2 K. The following values of ΔH°1 (kJ mol−1 of atoms) are reported; SmC2 = −25.7 ± 1.1; SmSi = −79.7 ± 2.9; SmSi2 = −66.3 ± 1.6; Sm5Si3 = −67.1 ± 2.5; Sm5Ge3 = −90.8 ± 2.0; Sm5Sn3 = − 77.9 ± 2.0.In addition to the Sm alloys, the enthalpies of formation of some non-congruently melting rare earth silicides of earlier lanthanide elements have also been determined to complete our systematic survey. The following values of ΔH°f (kJ mol−1 of atoms) are reported: LaSi = −73.9 ± 2.7; La5Si3 = −60.1 ± 2.6; La3Si2 = −61.6 ± 1.6; Ce5Si3 = −52.8 ± 0.6; Pr5Si3 = −67.6 ± 2.1; Nd5Si3 = −62.3 ± 1.9. These values were measured at 1473 K.The results are compared with some earlier experimental data, with available calorimetric values for the corresponding compounds of other lanthanide elements, and with predicted values from the semi-empirical model of Miedema and coworkers. We will also test the possible correlation between the enthalpies of formation and the changes in the relative volumes of the compounds as suggested by Gschneidner.

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