p-type electron transport in La1-xSrxFeO 3-δ at high temperatures

M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov*, K. R. Poeppelmeier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


Electrical conductivity, thermopower and oxygen content were measured for La1-xSrxFeO3-δ (x=0.2, 0.5, 0.9) within the oxygen partial pressure range 10-4-0.5 atm and at temperatures 750-950°C. The dominating charge carriers under these experimental conditions are electron holes. The results of oxygen nonstoichiometry measurements are used to estimate the concentration of holes and to analyze data on conductivity and thermopower. The changes in thermopower are described by the model assuming that the number of sites accessible for migration of holes is independent on oxygen content. The mobility of electron holes is calculated, and it is found to be virtually independent on temperature in the compositions with x<0.5 while compositions with x>0.5 exhibit thermally activated mobility and mobility values about 0.1 cm2 V -1 s-1 or smaller. It is suggested that the main contribution to the composition dependent variations in electron hole mobility are associated with Coulomb interactions at small x's, whereas at high degrees of doping the mobility of holes is most strongly affected by the increasing amount of oxygen vacancies.

Original languageEnglish (US)
Pages (from-to)921-927
Number of pages7
JournalJournal of Solid State Chemistry
Issue number3
StatePublished - Mar 2005


  • Conductivity
  • Ferrites
  • Mobility
  • Oxygen nonstoichiometry
  • Thermopower

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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