放電プラズマ焼結法で作製したNa_<1+x>Co_2O_4焼結体の熱電特性

概要

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Na_<1+x>Co_2O_4 ceramics were prepared by spark plasma sintering (SPS) and their thermoelectric properties were investigated from room temperature to 700℃ in air. The SPS process with cover pellets technique is effective in obtaining highly densified single phase Na_<1+x>Co_204 ceramics, typically 98% of the theoretical X-ray density, with lower resistivity. The power factor and figure of merit of the SPS treated NaCo_2O_4 ceramics attain 8.4 ×10_<-4>W・m_<-1>・K_<-2> and ZT=0.3 at 700℃, respectively.
社団法人日本セラミックス協会の論文
2003-04-01