抄録
We report on the temperature dependence of electrical resistivity and Seebeck coefficient for the p-type (Fe1-xRex)2VAl system with compositions 0≤x≤0.06 in addition to the result of measurements of thermal conductivity at room temperature. While Fe2VAl (x=0) exhibits a semiconductor-like behavior in electrical resistivity, a slight substitution of Re for Fe causes a significant decrease in the low-temperature resistivity and a large enhancement in the Seebeck coefficient, reaching 90 μV/K for x=0.04 at 300 K. The Seebeck coefficient is found to be substantially larger than that for the p-type Fe2(V1-yTiy)Al system. The thermal conductivity decreases more rapidly for the Re substitution than for the Ti substitution, showing that doping of heavier atoms such as Re reduces more effectively the lattice thermal conductivity.
