Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001)
(2017) In Ultramicroscopy 183. p.61-66- 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... (More)
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.
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- author
- Flege, Jan Ingo ; Krisponeit, Jon-Olaf ; Höcker, Jan ; Hoppe, Michael ; Niu, Y. LU ; Zakharov, A. LU ; Schaefer, A. LU ; Falta, Jens and Krasovskii, E. E.
- organization
- publishing date
- 2017-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Ceria, Electron scattering, Low-energy electron microscopy and Diffraction, Oxide films, Praseodymia, Rare-earth oxides
- in
- Ultramicroscopy
- volume
- 183
- pages
- 61 - 66
- publisher
- Elsevier
- external identifiers
-
- scopus:85019636911
- pmid:28526269
- wos:000415578200011
- ISSN
- 0304-3991
- DOI
- 10.1016/j.ultramic.2017.05.007
- language
- English
- LU publication?
- yes
- id
- 9691f284-18ae-45db-ba71-fa5f82377512
- date added to LUP
- 2017-06-09 14:41:23
- date last changed
- 2025-01-07 15:01:09
@article{9691f284-18ae-45db-ba71-fa5f82377512, abstract = {{<p>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 Pr<sub>2</sub>O<sub>3</sub>(0001) surface phases as well as a cubic Pr<sub>2</sub>O<sub>3</sub>(111) and a fluorite PrO<sub>2</sub>(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.</p>}}, author = {{Flege, Jan Ingo and Krisponeit, Jon-Olaf and Höcker, Jan and Hoppe, Michael and Niu, Y. and Zakharov, A. and Schaefer, A. and Falta, Jens and Krasovskii, E. E.}}, issn = {{0304-3991}}, keywords = {{Ceria; Electron scattering; Low-energy electron microscopy and Diffraction; Oxide films; Praseodymia; Rare-earth oxides}}, language = {{eng}}, pages = {{61--66}}, publisher = {{Elsevier}}, series = {{Ultramicroscopy}}, title = {{Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001)}}, url = {{http://dx.doi.org/10.1016/j.ultramic.2017.05.007}}, doi = {{10.1016/j.ultramic.2017.05.007}}, volume = {{183}}, year = {{2017}}, }