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; K. R. Poeppelmeier

doi:10.1006/jssc.2002.9722

Order-disorder enhanced oxygen conductivity and electron transport in Ruddlesden-Popper ferrite-titanate Sr₃Fe_2-xti_xO_6+δ

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

Northwestern University

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

The Ruddlesden-Popper ferrite Sr₃Fe₂O_6+δ and its titania-doped derivatives Sr₃Fe₂-_xTi_xO_6+δ, where 0<x≤2, have been characterized by X-ray powder diffraction and thermogravimetry. The changes in oxygen content and crystal lattice parameters are consistent with titanium ions entering the solid solution in 4+ oxidation state with octahedral oxygen coordination. Electronic conductivity measurements on polycrystalline Sr₃Fe₂O_6+δ and Sr₃Fe_0.8Ti_1.2 O_6+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 language	English
Pages (from-to)	275-283
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	168
Issue number	1
DOIs	https://doi.org/10.1006/jssc.2002.9722
Publication status	Published - Oct 2002

Keywords

Electron conductivity
Oxygen conductivity
Oxygen transfer
Ruddlesden-Popper ferrite
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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Order-disorder enhanced oxygen conductivity and electron transport in Ruddlesden-Popper ferrite-titanate Sr₃Fe_2-xti_xO_6+δ. / Shilova, Y. A.; Patrakeev, M. V.; Mitberg, E. B.; Leonidov, I. A.; Kozhevnikov, V. L.; Poeppelmeier, K. R.

In: Journal of Solid State Chemistry, Vol. 168, No. 1, 10.2002, p. 275-283.

Research output: Contribution to journal › Article › peer-review

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

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.",

keywords = "Electron conductivity, Oxygen conductivity, Oxygen transfer, Ruddlesden-Popper ferrite, Thermopower",

author = "Shilova, {Y. A.} and Patrakeev, {M. V.} and Mitberg, {E. B.} and Leonidov, {I. A.} and Kozhevnikov, {V. L.} and Poeppelmeier, {K. R.}",

note = "Funding Information: We acknowledge partial support of this work by the Russian Foundation for Basic Research (Grant 01-03-96519) and by sixth competition of the RAS young scientists (Grant 192). One of us (K.R.P.) is grateful to the EMSI program of the National Science Foundation and the US Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis.",

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AU - Leonidov, I. A.

AU - Kozhevnikov, V. L.

AU - Poeppelmeier, K. R.

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N2 - 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.

AB - 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.

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KW - Ruddlesden-Popper ferrite

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