Abstract
The standard enthalpies of formation of some 3d transition metal carbides have been measured by high-temperature reaction calorimetry. The following results are reported: (All data in kJ/mole of atoms). V 4C 3:−(40.3±1.2); Cr 7C 3:−(14.1±0.8); Mn 5C 2:−(8.9±1.5); Mn 7C 3:−(9.1±1.3); Fe 3C:4.7±1.1; Co 2C:2.8±1.3; Co 3C: 2.4±1.4; Ni 3C:1.2±1.3. These values were all obtained by direct synthesis experiments. For TiC we found−(92.9±8.9) by solute-solvent drop calorimetry. The results are compared with some earlier values derived from mass spectrometric data, gas equilibrium studies, EMF measurements, combustion calorimetry and solution calorimetry. They are also compared with predicted values from the semi-empirical model of Miedema and coworkers, and with available experimental enthalpies of formation for borides and nitrides formed by the same elements.
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