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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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