Influence of carbon nanotubes on thermoelectric properties of $p$- and $n$-type Heusler alloys

This paper presents the results of studying the effect of carbon nanotubes on thermoelectric properties of $p$-type (Nb$_{0.6}$Ta$_{0.4}$)$_{0.8}$Ti$_{0.2}$FeSb and $n$-type Ti$_{0.5}$Zr$_{0.25}$Hf$_{0.25}$NiSn half Heusler alloys. The experimental data obtained indicate a strong effect of the carbon nanotubes on electrical conductivity and Seebeck coefficient of the $n$-type compound, while the changes in these properties in the $p$-type compound were significantly less. It is suggested that a possible reason for this difference is the formation of a conducting cluster of carbon nanotubes in the sample of the $n$-type Heusler alloy.