Microstructure and high-temperature thermoelectric properties of polycrystalline CuAl1-xMgxO2 ceramics

K. Park, K. Y. Ko, J. K. Seong, S. Nahm

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl1-xMgxO2 (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl1-xMgxO2 bodies crystallized in CuAl1-xMgxO2 solid solutions along with MgAl2O4 and Cu2MgO3 phases. Mg substitution up to x = 0.12 in the CuAl1-xMgxO2 yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10-5 W m-1 K-2) was attained for CuAl0.88Mg0.12O2 at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.

Original languageEnglish
Pages (from-to)3735-3738
Number of pages4
JournalJournal of the European Ceramic Society
Volume27
Issue number13-15
DOIs
Publication statusPublished - 2007

Keywords

  • Electrical conductivity
  • Electron microscopy
  • MgO
  • Pressing
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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