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Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001)

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. (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
; ; ; ; ; ; ; and
organization
publishing date
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
2024-05-26 17:11:31
@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}},
}