The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Connectivity and Electrical Conductivity of YSZ-NiO Composite

  • Park, Young-Min (Department of Materials Science and Engineering, Pohang University) ;
  • Park, Gyeong-Man (Department of Materials Science and Engineering, Pohang University)
  • Published : 1998.06.01
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Abstract

The electrical properties of the mixed conducting yttria(8 mol%) stabilized zirconia(YSZ)-nickel oxide(NiO) composites were examined by a.c. impedance, 4-probe d.c. conductivity between 400 and $1000^{\circ}C$. The oxygen partial pressure dependence of conductivity, and electromotive force measurement of galvanic cell enabled to determine the electronic contribution to the conduction. Up to 6 vol% NiO addition, the conductivity decreased since the electronic NiO acted as an insulator in ionic matrix. However the ionic transport was dominant until NiO content reaches 26 vol%. Mixed conduction was observed between 26 and 68 vol% of NiO. The effect of composition on the electrical property was explained by the microstructure and thus by the distribution of two phases.

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