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Preparation of Delafossite CuYO2 by Metal-citric Acid Complex Decomposition Method

Published online by Cambridge University Press:  31 January 2011

Keishi Nishio ,
Tomomi Okada ,
Naoto Kikuchi ,
Satoshi Mikusu ,
Tsutomu Iida ,
Kazuyasu Tokiwa ,
Tsuneo Watanabe  and
Tohru Kineri
Keishi Nishio
Affiliation:
[email protected], Tokyo University of Science, Material Science and Technology, Noda-shi, Japan
Tomomi Okada
Affiliation:
[email protected], Tokyo University of Science, Material Science and Technology, Noda-shi, Japan
Naoto Kikuchi
Affiliation:
[email protected], National Institute of Advanced Industrial Science and Technology, Nanoelectronics Research Institute, Tsukuba-shi, Japan
Satoshi Mikusu
Affiliation:
[email protected], Tokyo University of Science, Applied Electronics, Noda-shi, Japan
Tsutomu Iida
Affiliation:
[email protected], Tokyo University of Science, Material Science and Technology, Noda-shi, Japan
Kazuyasu Tokiwa
Affiliation:
[email protected], Tokyo University of Science, Applied Electronics, Noda-shi, Japan
Tsuneo Watanabe
Affiliation:
[email protected], Tokyo University of Science, Applied Electronics, Noda-shi, Japan
Tohru Kineri
Affiliation:
[email protected], Tokyo University of Science, Yamaguchi, Materials Science & Environmental Engineering, Sanyo-Onoda-shi, Japan
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Abstract

Delafossite CuYO2 and Ca doped CuYO2 were prepared by thermal decomposition of a metal-citric acid complex. The starting solution consisted of Cu acetate, Y acetate and Ca acetate as the raw materials. Citric acid was used as the chelating agent, and acetic acid and distilled water were mixed as a solvent. The starting solutions were heated at 723 K for 5 h after drying at 353 K. The obtained powders were amorphous and single phase of orthorhombic Cu2Y2O5 was obtained by heat-treated the amorphous powder at a temperature range between 1073 and 1373 K for 3 h in air. Furthermore, Heat-treating the obtained orthorhombic Cu2Y2O5 at above 1373 K in air caused it to decompose into Y2O3, CuO and Cu2O. On the other hand, the sample powder prepared from a starting solution without citric acid, i.e., single phase of orthorhombic Cu2Y2O5 could not be obtained under the same synthesis conditions as that for a solution with citric acid. We were able to obtain delafossite CuYO2 and Ca doped CuYO2 from orthorhombic Cu2Y2O5 under a low O2 pressure atmosphere at above 1223 K. The obtained delafossite CuYO2 composed hexagonal and rhombohedral phases. The color of the CuYO2 powder was light brown and that of Ca-doped CuYO2 was light green. Diffraction peaks in the XRD pattern were slightly shifted by doping Ca for CuYO2, and these peaks shifted toward to a high diffraction angle with an increasing amount of doped Ca. From these results, we concluded that Ca doped delafossite CuYO2 could be obtained by thermal decomposition of a metal-citric acid complex.

Keywords

thermoelectricoxideceramic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1166: Symposium N – Materials and Devices for Thermal-to-Electric Energy Conversion , 2009 , 1166-N03-13
Copyright
Copyright © Materials Research Society 2009

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References

1 Terasaki, I., Sasago, Y., Uchinokura, K., Phys. Rev. B 56 (1997) R12685–R12687Google Scholar
2 Yakabe, H., kikuchi, K., Terasaki, I., Sasago, Y., Uchinokura, K., Proceedings of the 16th International Conference on Thermoelectrics, (1997) 523–527 Google Scholar
3 Li, S., Funahashi, R., Matsubara, I., Ueno, K., Sodeoka, S., Yamada, H., J. Mter. Chem., 9 (1999) 1659–1660 Google Scholar
4 Manoj, R., Nisha, M., Vanaja, K.A. and Jayaraj, M. K., Bull. Mater. Sci., 31 (2008) 49–53 Google Scholar
5 Tsuboi, N., Ohara, H., Hoshino, T., Kobayashi, S., Kato, K. and Kaneko, F., J. J. Appl. Phys., 44 (2005) 765–768 Google Scholar
6 Kale, G. M. and Jacob, K. T., Chem. Mater., 1 (1989) 515–519 Google Scholar
7 Tsuboi, N., Hoshino, T., Ohara, H., Suzuki, T., Kobayashi, S., Kato, K. and Kaneko, F., J. Phys. Chem. Solid, 66 (2005) 2134–2138 Google Scholar
8 Jayaraj, M. K., Draeseke, A. D., Tate, J. and Sleight, A. W., Thin Solid Films, 397 (2001) 244–248 Google Scholar
9 Pechini, M. P., US Patent (1967) 3330697 Google Scholar
10 Baythoun, M. S. G., Sale, F. R., J. Materials Science 17 (1982) 2757–2769 Google Scholar
11 Tai, L. W., Lessing, P. A., J.Mater. Res., 7 (1992) 502–510 Google Scholar
12 Roy, S., Sigmund, W. and Aldinger, F., J. Mater. Res. 14 (1999) 1524–1531 Google Scholar
13Keishi Nishio, Kazuma Takahashi, Yusuke Inaba, Mariko Sakamoto, Tsutomu Iida, Kazuyasu Tokiwa, Yasuo Kogo, Atsuo Yasumori, Tsuneo Watanabe, 23rd International Conference on Thermoelectrics-ITC2004 Proceedings, Released 2005 Google Scholar
14 Yoshimura, T., Nishio, K., Takahashi, K., Tokiwa, K., Kineri, T., Yasumori, A., and Watanabe, T., Transaction of the Materials Research Society of Japan, 30 (2005) p519–522 Google Scholar
15JCPDS No.37-929Google Scholar
16JCPDS No.39-244Google Scholar