Conductivity and carrier traps in La1-xSrxCo 1-zMnzO3-δ ( x=0.3; z=0 and 0.25)

V. L. Kozhevnikov, I. A. Leonidov, E. B. Mitberg, M. V. Patrakeev, A. N. Petrov, K. R. Poeppelmeier

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Measurements of the equilibrium oxygen content, electrical conductivity and thermopower in the perovskite-like solid solution La0.7Sr 0.3Co1-zMnzO3-δ (z=0 and 0.25) as a function of the temperature and oxygen partial pressure are used to determine the temperature dependence of the conductivity and thermopower at different values of the oxygen deficiency. A model for a hopping conductor with screened charge disproportionation is applied for the data analysis in combination with trapping reactions of n- and p-type carriers on local oxygen vacancy clusters and manganese cations, respectively. Changes in the ratio of n-type to p-type mobility are due to variations in oxygen vacancy concentration and manganese content, while the energetic parameters governing charge disproportionation of the trivalent cobalt cations and formation of vacancy associates are shown to be essentially invariable. These calculated charge carrier site occupancies are used to model temperature variations of the electrical properties in La0.7Sr0.3Co1-zMn zO3-δ in favorable correspondence with experimental observations.

Original languageEnglish
Pages (from-to)296-304
Number of pages9
JournalJournal of Solid State Chemistry
Volume172
Issue number2
DOIs
Publication statusPublished - May 2003

    Fingerprint

Keywords

  • Cobaltite
  • Electrical conductivity
  • Hopping conductor
  • Manganite
  • Oxygen content
  • Perovskite
  • Thermopower

ASJC Scopus subject areas

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

Cite this