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Correlation of O (1s) and Fe (2p) near edge x-ray absorption fine structure spectra and electrical conductivity of La/sub 1-x/Sr/sub x/Fe/sub 0.75/Ni/sub 0.25/O/sub 3- delta
| Author | Erat, S.; Braun, A.; Ovalle, A.; Piamonteze, C.; Zhi, Liu; Graule, T.; Gauckler, L. J. | |
| Year | 2009 | |
| Type | Journal Article | |
| Journal | Applied Physics Letters | |
| Pages | 174108 (3 pp.) | |
| Accession Numer | INSPEC:10968186 | |
| Abstract | A-site substitution of La/sup 3+/ by Sr/sup 2+/ in polaron conducting ABO/sub 3/-type perovskite La/sub 1-x/Sr/sub x/Fe/sub 0.75/Ni/sub 0.25/O/sub 3- delta / causes oxidation of Fe/sup 3+/ toward Fe/sup 4+/ and formation of conducting electron holes, as evidenced by Fe (2p) and O (1s) near edge x-ray absorption fine structure spectra. Hole doping is reflected by linear variation of the prepeak ratio e/sub g/(^)/[t/sub 2g/( darr )+e/sub g/( darr )] of oxygen spectra, along with increased conductivity. The significant increase in conductivity due to NiO doping in La/sub 1-x/Sr/sub x/FeO/sub 3- delta / is caused by increased overlap between Fe (3d) and O (2p) and charge transfer from the O (2p) to the Ni (3d) states, as concluded from near edge x-ray absorption fine structure spectra and ligand field multiplet calculations. | |
| Notes | Times Cited: 0 | |
| URL |
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| Record Number | 765 | |
| Group | nonmet |
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