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The electrical transport and thermoelectric properties of CoSb3 and double filled compounds Ca0.1CexCo4Sb12 (x=0.05, 0.1, and 0.15) were investigated in the temperature range from 5 to 300 K. The results indicated that double filling of Ca and Ce has a strong influence on the temperature dependence of the electrical resistivity. For samples CoSb3 and Ca0.1Ce0.05Co4Sb12, the relationship of ln ρ∝1/T existed only in the temperature regimes of 100–200 and 160–300 K, respectively, while Mott’s law ln ρ∝T−1/4 was obeyed at lower temperatures below 100 and 160 K for CoSb3 and Ca0.1Ce0.05Co4Sb12, respectively. The results suggested a localization of charge carriers. Moreover, a transition from the semiconducting state (i.e., dρ/dT 0) (0.05 0.5) was observed to be smaller than that of CoSb3. However, the increase in carrier concen...

Electrical transport and thermoelectric properties of double filled compounds Ca0.1CexCo4Sb12 at low temperatures