Order-disorder enhanced oxygen conductivity and electron transport in Ruddlesden-Popper ferrite-titanate Sr3Fe2-xtixO6+δ

Y. A. Shilova, M. V. Patrakeev, E. B. Mitberg, I. A. Leonidov, V. L. Kozhevnikov, Kenneth R Poeppelmeier

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Abstract

The Ruddlesden-Popper ferrite Sr3Fe2O6+δ and its titania-doped derivatives Sr3Fe2-xTixO6+δ, where 03Fe2O6+δ and Sr3Fe0.8Ti1.2 O6+δ in the temperature range 750-1000°C and oxygen partial pressures (pO2) varying between 10-20 and 0.5 atm revealed that the predominant partial conductivity of electrons is proportional to pO2 -1/4 in the low pO2 region, while the predominant partial contribution of holes to the conductivity is proportional to pO2 +1/4 in the high pO2 range. The pressure-independent oxygen ion conductivity is found to decrease with the increase in titanium content. A possible pathway for oxygen ion migration is discussed in relation to disorder in the oxygen sublattice and titanium doping.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalJournal of Solid State Chemistry
Volume168
Issue number1
DOIs
Publication statusPublished - Oct 2002

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Keywords

  • Electron conductivity
  • Oxygen conductivity
  • Oxygen transfer
  • Ruddlesden-Popper ferrite
  • Thermopower

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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