The La0.95Ni0.6Fe0.4O3CeO 2 system: Phase equilibria, crystal structure of components and transport properties

Elena Konysheva, John T.S. Irvine

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)

Abstract

Phase equilibria, crystal structure, and transport properties in the (100-x) La0.95Ni0.6Fe0.4O3xCeO 2 (LNFCx) system (x=275 mol%) were studied in air. Evolution of phase compositions and crystal structure of components was observed. The LNFCx (2≤x≤10) are three-phase and comprise the perovskite phase with rhombohedral symmetry (R3c), the modified ceria with fluorite structure (Fm3m), and NiO as a secondary phase. These multiphase compositions exhibit metallic-like conductivity above 300 °C. Their conductivity gradually decreases from 395.6 to 260.6 S/cm, whereas the activation energy remains the same (Ea=0.040.05 eV), implying the decrease in the concentration of charge carriers. Phase compositions in the LNFCx (25≤x≤75) are more complicated. A change from semiconducting to metallic-like conductivity behavior was observed in LNFC25 at about 550 °C. The conductivity of LNFCx (25≤x≤75) could be explained in terms of a modified simple mixture model.

Original languageEnglish
Pages (from-to)1499-1504
Number of pages6
JournalJournal of Solid State Chemistry
Volume184
Issue number6
DOIs
Publication statusPublished - Jun 2011
Externally publishedYes

Keywords

  • CeO
  • Conductivity
  • Perovskite
  • Phase equilibria

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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