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Strong local lattice instability in hexagonal ferrites RFe2O4 (R = Lu,Y,Yb) revealed by x-ray absorption spectroscopy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lafuerza, Sara García, Joaquín Subías, G. Sauca Blasco, Javier Serrano Cuartero, Vera |
| Copyright Year | 2014 |
| Abstract | mixed valence state. The maximum charge disproportionation compatible with the XANES spectra is 0.5 ± 0.1 electrons in the whole temperature range. The polarized EXAFS spectra have allowed us to analyze the local structure separating the different contributions mixed up in the polycrystal. Best-fit results show that the five oxygen atoms of the first coordination shell are at nearly the same distance but with a large Debye-Waller factor. Neither the interatomic distances nor the Debye-Waller factors of the first oxygen coordination shell change with temperature, indicating that the dynamical structural distortion of the high-temperature symmetric hexagonal phase freezes upon cooling down. Thus, the local structure instability of the mixed valence is in the origin of the structural transitions. |
| Starting Page | 045129 |
| Ending Page | 045129 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1103/PhysRevB.89.045129 |
| Volume Number | 89 |
| Alternate Webpage(s) | http://digital.csic.es/bitstream/10261/120953/1/Strong%20local%20lattice.pdf |
| Alternate Webpage(s) | https://doi.org/10.1103/PhysRevB.89.045129 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
