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Abstract
The vaporization behavior of Mo2C was investigated over the temperature range 2125° to 2550°K by Langmuir experiments utilizing an induction heated, ultrahigh vacuum thermobalance. A congruently vaporizing composition of MoC0.49 was found at temperatures from 2250° to 2300°C. The total evaporation rate increases and the heat of evaporation decreases as the carbon-to-metal ratio of the sample decreases from 0.49 to 0.44. A mass-spectrometric examination of the evaporate from MoC0.49 did not reveal any MoxCy molecules. Therefore, evaporation by decomposition is assumed. If monatomic gaseous species and unit evaporation coefficients are also assumed, the pressures over MoC0.49 are logPMo(atm)=7.112±0.139−(3.420±0.033) (104/T),logPC(atm)=6.351±0.139−(3.420±0.033) (104/T). The errors quoted are standard deviations. The heat of formation at 298°K of MoC0.49 is −4.9 kcal/mole from third-law calculations, in good agreement with the −5.5 kcal measured calorimetrically.
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