X. Huang, Y. Miyazaki, K. Yubuta, Y. Oide, T. Kajitani
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The thermoelectric properties of [Ca2CoO3]0.62[CoO2] textured ceramics
Large and high-quality single crystal flakes of [Ca2CoO 3]0.62[CoO2] compound were grown from Co3O4 and CaCO3 reagents with chloride flux. Typical single crystal flake size is about 5times5times0.02 mm 3. Obtained crystal flakes were consolidated by the spark plasma sintering (SPS) technique at 1100 K for 1 h. Grain alignment was checked by XRD and also was confirmed by SEM observations on the fractured surface. At 1000 K electrical conductivity of the textured ceramics is about 270 Scm-1, twice as higher than that of powder sample sintered by the SPS procedure. ZT value of the textured sample reaches 0.4 at 1000 K, being 50% improvement relative to the powder-sintered sample, though thermal conductivity increases simultaneously
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