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Nanoscale Bi2FeO6−x precipitates in BiFeO3 thin films : a metastable Aurivillius phase
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Deniz, Hakan, Bhatnagar, Akash, Pippel, Eckhard, Hillebrand, Reinald, Hähnel, Angelika, Alexe, M. (Marin) and Hesse, Dietrich (2014) Nanoscale Bi2FeO6−x precipitates in BiFeO3 thin films : a metastable Aurivillius phase. Journal of Materials Science, Volume 49 (Number 20). pp. 6952-6960. doi:10.1007/s10853-014-8400-3 ISSN 0022-2461.
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Official URL: http://dx.doi.org/10.1007/s10853-014-8400-3
Abstract
We report the observation of nano-scale precipitates corresponding to a new structure not displayed by the phase diagram of bismuth iron oxide. BiFeO3 (BFO) thin films grown on terbium scandate and strontium titanate substrates by pulsed laser deposition were investigated using high-resolution transmission and scanning transmission electron microscopy. Precipitate-like structures with a so far unknown metastable phase of bismuth, iron, and oxygen were observed in these films. They consist of well-ordered Bi2O2 layers, as they are known from bismuth oxide layered compounds. They have a pseudo-orthorhombic structure with a single perovskite-like unit (FeO6) sandwiched between Bi2O2 layers, similar to the Aurivillius phase Bi2WO6, with a chemical composition of the precipitates of Bi2FeO6−x . The structure of the new phase with its lattice constants was elucidated and the band gap of the precipitates was determined by electron energy loss spectroscopy. The results point to promising future applications for this new phase in the field of electronics, if it might be grown phase pure as an epitaxial thin film.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Journal of Materials Science | ||||||
| Publisher: | Springer | ||||||
| ISSN: | 0022-2461 | ||||||
| Official Date: | 1 October 2014 | ||||||
| Dates: |
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| Volume: | Volume 49 | ||||||
| Number: | Number 20 | ||||||
| Page Range: | pp. 6952-6960 | ||||||
| DOI: | 10.1007/s10853-014-8400-3 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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