Standard enthalpies of formation of some neodymium and gadolinium carbides, silicides and germanides by high-temperature direct-synthesis calorimetry

Add time:08/02/2019    Source:sciencedirect.com

The standard enthalpies of formation of some congruent-melting compounds in the binary systems Nd + X and Gd + X (where X = C, Si, Ge) have been determined by direct-synthesis calorimetry at 1473 ± 2 K. The following values of ΔH0f (kJ/g.atom) are reported: NdC2, −29.2 ± 1.4; NdSi2, −62.0 ± 1.9; NdSi, − 78.7 ± 2.5; Nd5Ge3, −72.1 ± 1.6; NdGe1.6, −80.2 ± 1.9; GdC2, −24.8 ± 1.6; Gd5Si3, − 68.0 ± 2.3; GdSi2, −59.0 ± 2.1; Gd5Ge3, −82.0 ± 2.6. The results are compared with some earlier experimental data (all derived from e.m.f. or vapor pressure measurements), with predicted values from Miedema's semi-empirical model, and with earlier calorimetric data for NdX3 and GdX3 (where X = Sn, Pb).

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