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- W1970663509 abstract "The vaporization behavior of niobium carbide was studied over the temperature range from 2260° to 2940°K utilizing the Langmuir method. NbC was observed to lose carbon preferentially down to a composition of NbC0.75, at which composition the vaporization proceeds congruently at a temperature of 2940°K. The vapor pressure of carbon above nearly stoichiometric NbC could be represented by the equation log P (atm) = 5.296–3.276×104/T with a corresponding second law heat of vaporization of 150 kcal/mole of C vaporized. However, third law calculations and heat of formation data indicate a ΔH0298 of from 180 to 189 kcal/mole. Several possible explanations of this disagreement are discussed. The total rate of evaporation from NbCx was found to increase by a factor of two as the value of x decreased from 0.97 to 0.80. Finally, a semi‐quantitative evaluation of the diffusion constant of C in NbC was made, resulting in a value of D≅8×10−7 cm2/sec at 2940°K." @default.
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- W1970663509 date "1962-07-15" @default.
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- W1970663509 title "Vaporization Behavior of Niobium Carbide" @default.
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- W1970663509 doi "https://doi.org/10.1063/1.1701322" @default.
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