Thermoelectric Properties of Group 13 Elements-Triple Filled Skutterudites: Nominal In<i>_x</i>Ga_0.02Tl_0.20Co₄Sb₁₂

Abstract

The high-temperature thermoelectric (TE) properties of group 13 elements (Ga, In, and Tl) triple-filled skutterudites in the nominal compositions of In x Ga 0.02 Tl 0.20 Co 4 Sb 12 (0¯x¯0.30) were investigated. All samples contained impurity phases in addition to the skutterudite matrix phase, i.e. some of the filler elements added to CoSb 3 precipitated as the metal state and antimonides. With increase the starting amount of In, the actual content of In increases while that of Tl decreases. Owing to phonon scattering by rattling of the group 13 elements, low lattice thermal conductivity was achieved, leading to relatively high TE figure of merit (ZT) for all samples. The maximum ZT value was 0.72 at 773 K obtained for the sample in the nominal composition of In 0

Low-temperature thermoelectric properties of p-type and n-type filled skutterudite compounds Sm y (Fe1−x Ni x )4Sb12 prepared under high pressure

“…Recently, skutterudite compounds filled by group 13 elements (Ga, In, and Tl) have attracted much attention as highperformance TE materials. 5,6) The R ions are located inside cages formed by twelve X ions. The large vibration (rattling) of R ions inside the cages is responsible for a substantial decrease in κ L to affect thermal transport properties and enhance ZT 7) The rattling motion is coherent optical phonon modes exhibiting anticrossing with acoustic phonon modes.…”