Abstract
The standard enthalpies of formation of the diborides of Sc, Ti, and V have been determined calorimetrically at (1400 ± 2) K. Each of these borides was dropped together with solid (platinum or palladium + boron) from room temperature into the calorimeter to generate liquid alloys (platinum or palladium + scandium or titanium or vanadium + boron). In separate experiments alloys of the same composition were formed by dropping the elements. The following values of Δ f H m o are reported: ScB 2, −(307.0 ± 14.8) kJ · mol −1; TiB 2, −(328.4 ± 10.2) kJ · mol −1; VB 1.925, −(206.9 ± 12.2) kJ · mol −1. The results are compared with earlier literature values where they exist. However, for ScB 2 there are no earlier values and for VB 2 only equilibrium values. The systematic variation of the enthalpy of formation of the diborides from ScB 2 to MnB 2 is discussed in relation to the structural parameters and to the change in MeMe, BB, and MeB bonding.
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