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Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method

Published online by Cambridge University Press:  23 January 2013

Natsuko Mikami ,
Keishi Nishio ,
Koya Arai ,
Tatsuya Sakamoto ,
Masahiro Minowa ,
Tomoyuki Nakamura ,
Naomi Hirayama ,
Yasuo Kogo  and
Tsutomu Iida
Natsuko Mikami
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Keishi Nishio
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Koya Arai
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Tatsuya Sakamoto
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Masahiro Minowa
Affiliation:
SWCC Showa Cable Systems Co., Ltd., LTD, 4-1-1 Minami-Hashimoto Chuo-Ku Sagamihara, Kanagawa, Japan
Tomoyuki Nakamura
Affiliation:
SWCC Showa Cable Systems Co., Ltd., LTD, 4-1-1 Minami-Hashimoto Chuo-Ku Sagamihara, Kanagawa, Japan
Naomi Hirayama
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Yasuo Kogo
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Tsutomu Iida
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
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Abstract

The thermoelectrical properties of α and γ phases of NaxCo2O4 having different amounts of Na were evaluated. The γ NaxCo2O4 samples were synthesized by thermal decomposition in a metal-citric acid compound, and the α NaxCo2O4 samples were synthesized by self-flux processing. Dense bulk ceramics were fabricated using spark plasma sintering (SPS), and the sintered samples were of high density and highly oriented. The thermoelectrical properties showed that γ NaxCo2O4 had higher electrical conductivity and lower thermal conductivity compared with α NaxCo2O4 and that α NaxCo2O4 had a larger Seebeck coefficient. These results show that γ NaxCo2O4 has a larger power factor and dimensionless figure of merit, ZT, than α NaxCo2O4.

Keywords

thermoelectricoxideenergy generation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 57 - 62
Copyright
Copyright © Materials Research Society 2013 

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References

REFERENCES

Terasaki, I., Sasago, Y. and Uchinokura, K., Phys. Rev. B, 1997, 56, 12685 CrossRefGoogle Scholar
Yakabe, H., Fujita, K., Nakamura, K. and Kikuchi, K., Proc. 17th Int. Conf. on Thermoelectric, (Nagoya, Japan, 1998) pp. 567–569.Google Scholar
Terasaki, I., Sasago, Y. and Uchinokura, K., Proc.17th Int. Conf. on Thermoelectric, (Nagaya, Japan, 1998) pp. 564–569 Google Scholar
Yakabe, H., Kikuchi, K., Terasaki, I., Sasago, Y. and Uchinokura, K., Proc. 16th Int. Conf. on Thermoelectric. (Dresden, Germany, 1997) pp. 523–527.hiGoogle Scholar
Terasaki, I., Ishii, Y., Tanaka, D., Takahata, K. and Iguchi, Y.: Jpn. J. Appl. Phy. 40 (2001) L65–L67 CrossRefGoogle Scholar
Motohashi, T., Naujails, E., Ueda, R., Isawa, K., Karppinen, M. and Ya-mauchi, H., Appl. Phys. Lett. 79, 1480 (2001).CrossRefGoogle Scholar
Nishio, Keishi, Takahashi, Kazuma, Inaba, Yusuke, Sakamoto, Mariko, Iida, Tsutomu, Tokiwa, Kazuyasu, Kogo, Yasuo, Yasumori, Atsuo, Watanabe, Tsuneo, 23rd International Conference on Thermoelectrics-ITC2004 in Adelaide (Australia) Proceedings CD (Paper No. #97), Released (2005) Google Scholar