Insight into the Effects of Fe Addition on the Local Structure and Electronic Properties of SrTiO3
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http://dx.doi.org/10.1021/jp408839q |
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Title
Insight into the Effects of Fe Addition on the Local Structure and Electronic Properties of SrTiO3Author (s)
Date
2014-01Publisher
American Chemical SocietyBibliographic citation
DA SILVA, Luís F., et al. Insight into the Effects of Fe Addition on the Local Structure and Electronic Properties of SrTiO3. The Journal of Physical Chemistry C, 2014, 118.9: 4930-4940.Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/jp408839qVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
This paper reports an experimental and theoretical investigation of the effects of adding Fe to the perovskite strontium titanate SrTiO3. The effects include changes in the short-order range structure as well as in ... [+]
This paper reports an experimental and theoretical investigation of the effects of adding Fe to the perovskite strontium titanate SrTiO3. The effects include changes in the short-order range structure as well as in the electronic and electrical properties. X-ray diffraction analysis reveals that the SrTi1–xFexO3 network shrinks with increasing Fe content, while X-ray absorption spectroscopy measurements of the Ti and Fe K-edge revealed the presence of some under-coordinated TiO5 units created because of the partial replacement of Fe3+ ions in the Ti4+ site. UV–visible absorption spectra indicated a reduction in optical gap with increasing Fe content. The electronic structure and spin densities of STFO with x = 0, 0.0625, 0.125, 0.5, and 1 are calculated by the DFT method at the B3LYP computational level, showing a Jahn–Teller distortion of O atoms surrounding the Fe as well as the formation of under-coordinated TiO5 units. From the electrical viewpoint, the results show that STFO is a mixed (ionic and electronic) conductor and that the electronic contribution becomes dominant with increasing Fe content. [-]
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J. Phys. Chem. C, 2014, 118 (9)Rights
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