Thermal properties of Nb2SnC

Abstract

In this article we report on the thermal properties of the ternary carbide Nb 2 SnC. Its heat capacity, c p , is 75 J/mol K at ambient temperatures and increases to Ϸ115 J/mol K at 1300 K. Analysis of c p measurements in the 4-15 K temperature range yields a Debye temperature of 324 K and a density of states at the Fermi level of 2.66 ͑eV unit cell͒ Ϫ1 . At room temperature, the thermal conductivity is 17 W/m K and it increases to Ϸ31 W/m K at 1500 K. At temperatures greater than 600 K, roughly 85% of the heat is transported by electronic defects ͑i.e., electrons and/or holes͒. The thermal properties of Nb 2 SnC are quite comparable to those of near-stoichiometric NbC x .

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