High-Temperature Electrical Conductivity of LaCr1−xCoxO3 Ceramics

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 roo...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2016-03, Vol.99 (3), p.917-921
Main Authors: Bonet, Alexander, to Baben, Moritz, Travitzky, Nahum, Greil, Peter
Format: Article
Language:English
Subjects:
Ceramics
Conductivity
Sintering
Online Access:Get full text
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Summary: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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14038