Effects of Ag Addition on Microstructure and Thermoelectric Properties of Na<I><SUB>x</SUB></I>Co<SUB>2</SUB>O<SUB>4</SUB> Synthesized by Citric Acid Complex Process

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  • Ito Mikio
    Course of Materials Science and Engineering, Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Furumoto Daisuke
    Course of Materials Science and Engineering, Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

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  • Effects of Ag addition on microstructure and thermoelectric properties of NaxCo2O4 synthesized by citric acid complex process

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Abstract

A thermoelectric NaxCo2O4/Ag composite was synthesized by citric acid complex process using CH3COOAg as an Ag source. The powder precursor after calcination was composed of plate-like NaxCo2O4 grains and Ag particles. The Ag addition deteriorated crystallographic anisotropy of the sintered body. However, the electrical resistivity and the Seebeck coefficient of this composite were significantly smaller and slightly larger, respectively, than those of the sample without Ag, resulting in lager power factor. The Ag phase dispersed in the NaxCo2O4 matrix contained about 5–17 at.% Co, which is considered to cause the increase in Seebeck coefficient.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 48 (12), 3160-3163, 2007

    The Japan Institute of Metals and Materials

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