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.

We also recommend Trading Suppliers and Manufacturers of HOLMIUM SILICIDE (cas 12136-24-2). Pls Click Website Link as below: cas 12136-24-2 suppliers