Structure and transport behavior of In-filled cobalt rhodium antimonide skutterudites

► Unfilled and indium-filled cobalt and rhodium skutterudite solid solutions were synthesized. ► Indium filling stabilizes the cobalt and rhodium skutterudite solid solutions. ► The thermoelectric properties of all compositions are reported. ► The thermal conductivity of rhodium-rich compositions is strongly affected by indium filling. ► Void-site filled indium was found to be metastable.