Flege, J.I., Krisponeit, J.-O., Höcker, J., Hoppe, M., Niu, Yuran  ORCID: https://orcid.org/0000-0003-0491-892X, Zakharov, A., Schaefer, A., Falta, J. and Krasovskii, E.E.
2017.
Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001).
Ultramicroscopy
183
, pp. 61-66.
10.1016/j.ultramic.2017.05.007
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Abstract
The complex structure and morphology of ultrathin praseodymia films deposited on a ruthenium(0001) single crystal substrate by reactive molecular beam epitaxy is analyzed by intensity-voltage low-energy electron microscopy in combination with theoretical calculations within an ab initio scattering theory. A rich coexistence of various nanoscale crystalline surface structures is identified for the as-grown samples, notably comprising two distinct oxygen-terminated hexagonal Pr2O3(0001) surface phases as well as a cubic Pr2O3(111) and a fluorite PrO2(111) surface component. Furthermore, scattering theory reveals a striking similarity between the electron reflectivity spectra of praseodymia and ceria due to very efficient screening of the nuclear charge by the extra 4f electron in the former case.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Subjects: | Q Science > QC Physics |
| Uncontrolled Keywords: | Praseodymia; Ceria; Low-energy electron microscopy and Diffraction; Oxide films; Rare-earth oxides; Electron scattering |
| Publisher: | Elsevier |
| ISSN: | 0304-3991 |
| Date of First Compliant Deposit: | 15 June 2017 |
| Date of Acceptance: | 9 May 2017 |
| Last Modified: | 26 Nov 2024 17:15 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/101429 |
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