Abstract
High-temperature electrical conductivity measurements, structural data from powder X-ray diffraction and 57Fe Mössbauer spectroscopy were combined to study the interrelationship of oxygen ion transport and p- and n-type transport in Sr2(Fe1-xGax)2O 5, where x = 0, 0.1 and 0.2. Although gallium substitution generally decreases the total ion-electron transport, the transition of the orthorhombic brownmillerite structure to a cubic phase on heating results in the recurrence of the conductivity to the same high level as in the parent ferrite (x = 0). The changes of the partial contributions to the total conductivity as a function of x are shown to reflect a complicated interplay of the disordering processes that develop in the oxygen sublattice on heating in response to replacement of iron with gallium.
Original language | English (US) |
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Pages (from-to) | 3045-3051 |
Number of pages | 7 |
Journal | Journal of Solid State Chemistry |
Volume | 179 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2006 |
Funding
Authors are grateful to the Ural Branch of the Russian Academy of Science for support of this work under cooperation agreement #7-1. The present work has been also supported in part by the Grant #978002 from the NATO SfP program, and by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, US Department of Energy under Award #DE-FG02-03-ER15457.
Keywords
- Electrical conductivity
- Mössbauer spectroscopy
- Strontium ferrite
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry