Influence of oxide impurities on the chemical tuning of the thermoelectric properties of substitution derivatives of RuIn3

Microstructure (perpendicular to the pressure axis; polarized light) of polycrystalline Ru0.95Rh0.05In3 (a), Ru0.95Ir0.05In3 (b) and Ru0.95Re0.05In3 (c) samples after SPS treatment.