Enthalpy and specific heat of tantalum carbide in its homogeneity region
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Using the method of mixing in a massive calorimeter, measurements were made of the enthalpy of the carbides TaC0.70, TaC0.78, TaC0.85, and TaC0.99 over the temperature range 1200–2200°K.
The specific heat of the cubic tantalum carbide TaCx in its homogeneity region over the temperature range 1200–2200°K can be described, as a function of temperature, by the equation:Cp=7.3−1.5· 10−3T+(0.773+1. 467·10−3T·ex.
The results obtained together with literature data were used in compiling a table of values of enthalpy, specific heat, entropy, and reduced thermodynamic potential for the carbide TaC0.99 over the temperature range 298–2500°K.
KeywordsEntropy Carbide Enthalpy Calorimeter Tantalum
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