Synthesis of Ca3Co4O9 Powders by Ultrasonic Spray Pyrolysis Method and the Electrical Properties of the Sintered Bodies

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  • Eguchi Masayuki
    Materials Chemistry and Physics, graduate School of Science and Technology, Chiba University
  • Nishiyama Shin
    Materials Technology, Faculty of Engineering, Chiba University
  • Hattori Takeo
    Materials Technology, Faculty of Engineering, Chiba University

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Other Title
  • 熱電変換材料　　超音波噴霧熱分解法を用いたＣａ３Ｃｏ４Ｏ９粉末の合成とその焼結体の電気的性質
  • チョウオンパ フンム ネツ ブンカイホウ オ モチイタ Ca3Co4O9 フンマツ ノ ゴウセイ ト ソノ ショウケツタイ ノ デンキテキ セイシツ

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Abstract

Ca3Co4O9 was synthesized by ultrasonic spray pyrolysis (USP) method. The concentration of metal ions in the starting solution was 0.1 mol/l or 0.01 mol/l as Ca3Co4O9, and as the solvent, each of pure water, H2O2 solution or HNO3 solution was used. The solution was sprayed in the furnace and pyrolyzed at 1073 K. X-ray powder diffraction analysis confirmed that all the powders prepared by USP were Ca-Co oxide. The powders were calcined at 1073 K and then sintered at 1173 K. The same sintering conditions were used for the powders prepared by the solid state reaction. The density of the sintered bodies prepared from USP powders ranged in 2.5-2.8gcm-3 and they differed by the solvent of the starting solution. The density of the sintered bodies prepared by solid state reaction was higher than those by USP. The electrical conductivity of the sintered bodies prepared by USP ranged in 4700-5000 Sm-1 at 1073 K, which was higher than those by solid state reaction. In contrast, Seebeck coefficient of the bodies prepared by USP was 106-108μVK-1 at 1073 K, being smaller than those by solid state reaction.

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