Abstract

We have studied crystal structure and transport properties of the quasi one-dimensional cobalt oxide CaCo 2O 4. The CaCo 2O 4 phase crystallizes in calcium-ferrite type structure, which consists of a corner- and edge-shared CoO 6 octahedron network including one-dimensional double chains. Large thermoelectric power ( S ∼ 150 μV/K at 390 K) with metallic temperature dependence of S, moderate resistivity ( ρ ∼ 2.9 × 10 −1 Ω cm at 390 K) with carrier localization at low temperature, and normal thermal conductivity ( κ ∼ 6.3 W/Km at 390 K) were observed. The phonon mean-free path was calculated from the observed data, as a function of temperature. The long phonon mean-free path ( l ∼ 24 Å at 300 K) implies that the thermal conductivity could be suppressed by impurity scattering of phonons with partial element substitution.

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