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

Jan Ingo Flege; Jon-Olaf Krisponeit; Jan Höcker; Michael Hoppe; Y. Niu; A. Zakharov; A. Schaefer; Jens Falta; E. E. Krasovskii

doi:10.1016/j.ultramic.2017.05.007

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

Jan Ingo Flege, Jon-Olaf Krisponeit, Jan Höcker, Michael Hoppe, Y. Niu, A. Zakharov, A. Schaefer, Jens Falta, E. E. Krasovskii

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	61-66
Journal	Ultramicroscopy
Volume	183
Early online date	2017 May 10
DOIs	https://doi.org/10.1016/j.ultramic.2017.05.007
Publication status	Published - 2017 Dec

Subject classification (UKÄ)

Materials Chemistry

Free keywords

Ceria
Electron scattering
Low-energy electron microscopy and Diffraction
Oxide films
Praseodymia
Rare-earth oxides

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10.1016/j.ultramic.2017.05.007

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@article{9691f28418ae45dbba71fa5f82377512,

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

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.",

keywords = "Ceria, Electron scattering, Low-energy electron microscopy and Diffraction, Oxide films, Praseodymia, Rare-earth oxides",

author = "Flege, {Jan Ingo} and Jon-Olaf Krisponeit and Jan H{\"o}cker and Michael Hoppe and Y. Niu and A. Zakharov and A. Schaefer and Jens Falta and Krasovskii, {E. E.}",

year = "2017",

month = dec,

doi = "10.1016/j.ultramic.2017.05.007",

language = "English",

volume = "183",

pages = "61--66",

journal = "Ultramicroscopy",

issn = "0304-3991",

publisher = "Elsevier",

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T1 - Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001)

AU - Flege, Jan Ingo

AU - Krisponeit, Jon-Olaf

AU - Höcker, Jan

AU - Hoppe, Michael

AU - Niu, Y.

AU - Zakharov, A.

AU - Schaefer, A.

AU - Falta, Jens

AU - Krasovskii, E. E.

PY - 2017/12

Y1 - 2017/12

N2 - 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.

AB - 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.

KW - Ceria

KW - Electron scattering

KW - Low-energy electron microscopy and Diffraction

KW - Oxide films

KW - Praseodymia

KW - Rare-earth oxides

UR - http://www.scopus.com/inward/record.url?scp=85019636911&partnerID=8YFLogxK

U2 - 10.1016/j.ultramic.2017.05.007

DO - 10.1016/j.ultramic.2017.05.007

M3 - Article

C2 - 28526269

AN - SCOPUS:85019636911

SN - 0304-3991

VL - 183

SP - 61

EP - 66

JO - Ultramicroscopy

JF - Ultramicroscopy

ER -

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

Abstract

Subject classification (UKÄ)

Free keywords

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