Thermoelectric properties of In1Co4Sb12+δ: role of in situ formed InSb precipitates, Sb overstoichiometry, and processing conditions

In-filled skutterudites InxCo4Sb12 have attracted much attention due to their relatively high thermoelectric performance, which, in turn, is attributed to the In atoms acting as rattlers in the skutterudite voids and to the formation of InSb precipitates when the In solubility limit is exceeded (0.22 ⩽ xmax