The heat capacities, thermal-expansion coefficients, thermal and electrical conductivities of Nb 2 AlC (actual Nb:Al:C mole fractions: 0.525 Ϯ 0.005, 0.240 Ϯ 0.002, and 0.235 Ϯ 0.005, respectively), Ti 2 AlC and (Ti, Nb) 2 AlC (actual Ti:Nb:Al:C mole fractions: 0.244 Ϯ 0.005, 0.273 Ϯ 0.005, 0.240 Ϯ 0.003, and 0.244 Ϯ 0.005, respectively) were measured as a function of temperature. These ternaries are good electrical conductors, with a resistivity that increases linearly with increasing temperatures. The resistivity of (Ti, Nb) 2 AlC is higher than the other members, indicating a solid-solution scattering effect. The thermal-expansion coefficients, in the 25 ЊC to 1000 ЊC temperature range, are comparable and fall in the narrow range of 8.7 to 8.9 ϫ 10 Ϫ6 K Ϫ1 , with that of the solid solution being the highest. They are all good conductors of heat, with thermal conductivities in the range between 15 to 45 W/m K at room temperature. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures for Nb 2 AlC and (Ti, Nb) 2 AlC. The conductivity of Ti 2 AlC, on the other hand, is high because the phonon contribution to the conductivity is nonnegligible.M.W. BARSOUM, Professor, I. SALAMA, and T. EL-RAGHY are with
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