The Constituent Additivity Method to Estimate Heat Capacities of Complex Inorganic Solids

• Liyan Qiu ^[1] ; Mary Anne White ^[1]
  1. [1] Dalhousie University

     Dalhousie University

     Canadá

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 78, Nº 8, 2001, pág. 1076
• Idioma: inglés
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• Resumen

  • Heat capacity is one of the most fundamental of all physical properties, yet it is exceedingly unlikely that it will be determined experimentally for all materials. Heat capacity plays an important role in understanding thermodynamic stability, from the perspective of relative enthalpies, entropies, and Gibbs energies of comparative compounds. Therefore, methods to estimate a material's heat capacity could be very useful. We outline such a method for complex inorganic solids, based on additivity of constituent species. This method is especially useful at and above about 150 K, often giving results within a few percent of experimental determinations. Several examples are presented, and the utility and limitations of this method of heat capacity estimation and its uses in teaching are discussed.