Advanced

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.

(Less)
Please use this url to cite or link to this publication:
author
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
  • 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
2018-10-07 04:56:54
@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},
  keyword      = {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},
  volume       = {183},
  year         = {2017},
}