Abstract
We report the structural, electrical, thermal and magnetic properties of NaCo1−x B x O2 from 300 K down to 5 K. XRD analysis shows that B ions successfully incorporate in the crystal structure for x 0.5. The highest thermopower value is obtained for x = 0.5 sample, and the thermoelectric behavior at low temperature is explained by Mott approximation. The experimentally obtained thermal conductivity data are analyzed by this model including the carrier thermal term, κ c, and the lattice thermal conductivity term, κ L. We found that phonon–phonon interaction and point defect contribution to κ are affected by the B content and the temperature. The Co valance states are analyzed by Heike formula, and the effective magnetic moment is determined by these values. The χ–T curves of the samples are fitted by Curie–Weiss law, and the obtained μ eff values match well with the theoretically calculated values (0.9 μB/Co). We observed a strong correlation between magnetic properties and thermopower.
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