Standard enthalpies of formation of some carbides, silicides, germanides and borides of holmium by high temperature direct synthesis calorimetry

Add time:08/04/2019    Source:sciencedirect.com

The standard enthalpies of formation for some Holmium alloys in the binary systems HoX (where X  C, Si, Ge, B) have been determined by direct synthesis calorimetry at 1473±2 K. The following values of ΔH1α(298 K) kJ (mol of atoms)1 are reported: HoC2 = −28.6±1.2; HoSi = −80.9±2.2; HoSi2 = −57.8±2.4; Ho5Si3 = −74.6±2.1; Ho5Ge3 = −91.8±1.7; HoB2 = −27.9±1.5. The results are compared with some earlier experimental values derived from mass spectrometric measurements, with available calorimetric data for the corresponding compounds of some of the early lanthamide elements, and with predicted values from the semi-empirical model of Miedema and co-workers. We also test the possible correlation between the enthalpies of formation and the relative molar volumes of the compounds as suggested by Gschneidner.

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