Japanese Journal of Applied Physics · 2003 · 42 citations · 1 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMagnetic MaterialsElectrical Properties Of CeramicsMagnetic CeramicsMagnetic OxidesSinteringThermal Properties Of CeramicsThermoelectric MaterialsCeramic SynthesisPower FactorResistivitySeebeck CoefficientSpark Plasma SinteringThermoelectric Energy ConversionThermoelectric PropertiesThermoelectric Transport
We report the preparation of highly grain-aligned and densified [Ca2CoO3-δ]0.62CoO2 bulks and their high thermoelectric performance. The highly c-axis aligned (F=0.94) and densified samples with low resistivity at room temperature (∼5 mΩ·cm) were obtained by the combination of magnetic alignment and spark-plasma-sintering (SPS) methods. Resistivity ρ and Seebeck coefficient S along the ab plane were systematically changed with oxygen content and, consequently, a power factor (=S2/ρ) was enhanced up to 3.5×10-6 W·cm-1·K-2 at 300 K for the sample annealed at 500°C in air.
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