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

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

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

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 x0.5 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
Pages (from-to)921-927
Number of pages7
JournalJournal of Solid State Chemistry
Volume178
Issue number3
DOIs
Publication statusPublished - Mar 2005

Fingerprint

Thermoelectric power
Oxygen
oxygen
Electrons
electrons
Temperature
Hole mobility
Oxygen vacancies
Coulomb interactions
Charge carriers
Chemical analysis
Partial pressure
Doping (additives)
hole mobility
electron mobility
partial pressure
Electron Transport
charge carriers
conductivity
electrical resistivity

Keywords

  • Conductivity
  • Ferrites
  • Mobility
  • Oxygen nonstoichiometry
  • Thermopower

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

p-type electron transport in La1-xSrxFeO 3-δ at high temperatures. / Patrakeev, M. V.; Leonidov, I. A.; Kozhevnikov, V. L.; Poeppelmeier, Kenneth R.

In: Journal of Solid State Chemistry, Vol. 178, No. 3, 03.2005, p. 921-927.

Research output: Contribution to journalArticle

Patrakeev, M. V. ; Leonidov, I. A. ; Kozhevnikov, V. L. ; Poeppelmeier, Kenneth R. / p-type electron transport in La1-xSrxFeO 3-δ at high temperatures. In: Journal of Solid State Chemistry. 2005 ; Vol. 178, No. 3. pp. 921-927.
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