Thermodynamic properties of liquid alloys of gadolinium with silicon

Experimental investigation and thermodynamic modeling of the Gd–Si system

“…11 and 12, there are large discrepancies between the calculation and experimental data [16,18,19] for the enthalpy and entropy of formation of solids at 800 K, especially on the Gd-rich side. The calculated enthalpies of mixing of the liquid phase at 1770 K together with the experimental data of Kanibolotsky et al [22,24] and Beloborodova et al [23] are shown in Fig. 13.…”

“…The Gibbs energy, enthalpy and entropy of formation of the compounds Gd 5 Si 3 [16,17], Gd 5 Si 4 [16,17], GdSi [16], Gd 2 Si 3 [16] and GdSi 2−x [16,18] were investigated by Lukashenko et al [16,18], Sidorko and Polotsokaya, [17] and Lukashenko and Polotskaya [19] by measuring the emf of high-temperature galvanic cells in the temperature range of 600-960 K and the Gibbs energy of formation of Gd 3 Si 5 was calculated by Uspenskaya et al [20]. The enthalpies of mixing of Gd-Si alloys have been measured by high-temperature calorimetry on Si-rich side (94-100 at.% Si) at 1800 K [21], in the composition ranges 0 < x Si < 0.2 and 0.8 < x Si < 1, and 0 < x Si < 0.2 and 0.7 < x Si < 1 at 1760 K [22,23], and those over the entire composition range at 1770 ± 5 K [24]. The enthalpy of formation for the solid phases and enthalpies of mixing of liquid are all negative.…”

Thermodynamic properties of Ge-Mn melts

“…The temperature signal was fed to a recording potentiometer, and heat effects were determined by "weighing." The partial enthalpies of mixing of the components and the total enthalpies of mixing of Ge-Mn melts were determined from calorimetric curves as described in [5]. The partial and total molar enthalpies were fitted by power polynomials.…”