Persistent Octahedral Coordination in Amorphous GeO₂ Up to 100 GPa by Kβ'' X-Ray Emission Spectroscopy
- We measure valence-to-core x-ray emission spectra of compressed crystalline GeO₂ up to 56 GPa and of amorphous GeO₂ up to 100 GPa. In a novel approach, we extract the Ge coordination number and mean Ge-O distances from the emission energy and the intensity of the Kβ'' emission line. The spectra of high-pressure polymorphs are calculated using the Bethe-Salpeter equation. Trends observed in the experimental and calculated spectra are found to match only when utilizing an octahedral model. The results reveal persistent octahedral Ge coordination with increasing distortion, similar to the compaction mechanism in the sequence of octahedrally coordinated crystalline GeO₂ high-pressure polymorphs.
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| Author details: | Georg SpiekermannORCiDGND, M. Harder, Keith Gilmore, Peter Zalden, Christoph J. Sahle, Sylvain Petitgirard, Max WilkeORCiDGND, Nicole BiedermannORCiD, Thomas Weis, Wolfgang MorgenrothORCiDGND, John S. Tse, E. Kulik, Norimasa Nishiyama, Hasan Yavaş, Christian Sternemann |
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| URN: | urn:nbn:de:kobv:517-opus4-427755 |
| DOI: | https://doi.org/10.25932/publishup-42775 |
| ISSN: | 1866-8372 |
| Title of parent work (German): | Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe |
| Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (699) |
| Publication type: | Postprint |
| Language: | English |
| Date of first publication: | 2019/04/23 |
| Publication year: | 2019 |
| Publishing institution: | Universität Potsdam |
| Release date: | 2019/04/23 |
| Tag: | CU; MO; SIO₂; complexes; crystalline; glass; oxygen; pressures; rutile-type; silicon |
| Issue: | 699 |
| Source: | Physical Review X 9 (2019) 1, Art. 011025 DOI: 10.1103/PhysRevX.9.011025 |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| Publishing method: | Open Access |
| License (German): |  CC-BY - Namensnennung 4.0 International |
| External remark: | Bibliographieeintrag der Originalveröffentlichung/Quelle |
