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期刊论文
Fabrication and thermoelectric properties of Ca3−xDyxCo4O9+δ system
Journal of Alloys and Compounds 376(2004)58-61，-0001，（）：
Ca3−xDyxCo4O9+δ (x=0, 0.15, 0.3 and 0.45) polycrystalline samples have been prepared using a sol-gel process followed by SPS sintering. Their thermoelectric properties have been carefully studied from room temperature to 1000 K. The substitution of Dy for Ca results in increasing of both thermopower and electrical resistivity, which could be attributed to the decreasing of carrier concentrations. The Dy substituted samples (x=0, 0.3) have lower thermal conductivity than Ca3Co4O9+δ due to their lower electronic and lattice thermal conductivities. The dimensionless figure of merit ZT reaches 0.27 at 1000K for the sample of Ca2.7Dy0.3Co4O9+δ.
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