High-Temperature Electrical Conductivity of LaCr1-xCoxO3 Ceramics

Alexander Bonet, Moritz To Baben, Nahum Travitzky, Peter Greil

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16 Citations (Scopus)

Abstract

LaCr1-xCoxO3 solid-solution ceramics (x = 0.0-0.3) were prepared by pressureless sintering of a submicrometer powder. The powder was synthesized by a modified glycine nitrate process at 800°C. The electrical conductivity of the material sintered at 1600°C was measured by AC four-wire method from room temperature to 1200°C. While undoped (x = 0) LaCrO3 revealed semiconductivity dominated by thermally activated mobility of small polarons over a vast temperature range, substitution of Co for Cr gave rise for a pronounced enhancement of conductivity at temperatures >200°C. XPS analysis showed that the concentration of Cr4+ on the Cr-site and Co2+ at the Co-site increased with Co substitution suggesting a thermally activated redox reaction Cr3+ + Co3+→Cr4+ + Co2+ to create additional charge carriers. Thus, Co doping offers a high potential for designing the electrical conductivity making LaCr1-xCoxO3 an interesting resistivity material for high temperature applications.

Original languageEnglish
Pages (from-to)917-921
Number of pages5
JournalJournal of the American Ceramic Society
Volume99
Issue number3
DOIs
Publication statusPublished - 1 Mar 2016
Externally publishedYes

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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