Effect of microstructure on the electric properties of NaCo2O4 ceramics

Yin Wu, Jun Wang, Bo Yu Zhang, Yan Li, Lei Miao

Research output: Contribution to journalArticlepeer-review

Abstract

NaCo2O4 polycrystalline powders were synthesized by self-flux method, and then ceramic samples were prepared by two methods of uniaxial pressing and cold isostatic pressing. Phases and micro-morphology analysis as well as its electric properties were observed. The impacts of grain preferred orientation and relative density of NaCo2O4 ceramics on electric properties were investigated accordingly. As a result, a higher electrical conductivity and power factor of sample are caused by its higher preferred orientation degree and relative density. The sample of Na∶ Co=0.7∶1 with uniaxial pressure is proved to have a higher preferred orientation degree and relative density comparatively. Meanwhile, it can be observed that electrical conductivity reaches to a maximum value of 4.2×104 S·m-1 at 303 K, and a maximum value of power factor equals to 450μ W·m-1·K-2 at 823 K.

Original languageEnglish
Pages (from-to)2474-2478
Number of pages5
JournalRengong Jingti Xuebao/Journal of Synthetic Crystals
Volume44
Issue number9
Publication statusPublished - 2015 Sep 1
Externally publishedYes

Keywords

  • Conductivity
  • NaCoO
  • Preferred orientation
  • Relative density
  • Self-flux method

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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