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Journal of Undergraduate Research

Keywords

thermodynamic studies, technologically significant silicides, inorganic materials

College

Physical and Mathematical Sciences

Department

Chemistry and Biochemistry

Abstract

Vanadium, molybdenum, and tungsten silicides are inorganic materials that have many practical applications at high temperatures and high pressures1. Eight compounds which are of particular interest are found in Table 1. Accurate thermodynamic data aids in the synthesis of high purity, single phase materials. For example, knowledge of the Gibbs free energies as a function of temperature and pressure allows one to predict relative stabilities of the binary compounds. Calculation of this thermodynamic property requires the enthalpy of formation of these materials as well as their entropies and heat capacities. The enthalpies have been reported for many of these compounds at room temperature.2,3 However, the low temperature heat capacity data needed to obtain the free energies are not generally available. In addition the high temperature heat capacity data used to extend the free energies to high temperatures needed for synthetic applications show considerable disagreement.1

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