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Preparation and stability of the hexagonal phase of samarium oxide on Ru(0001)

  • We have used low-energy electron microscopy (LEEM), micro-illumination low-energy electron diffraction (µLEED) supported by ab initio calculations, and X-ray absorption spectroscopy (XAS) to investigate in-situ and in real-time the structural properties of Sm2O3 deposits grown on Ru(0001), a rare-earth metal oxide model catalyst. Our results show that samarium oxide grows in a hexagonal A-Sm2O3 phase on Ru(0001), exhibiting a (0001) oriented-top facet and (113) side facets. Upon annealing, a structural transition from the hexagonal to cubic phase occurs, in which the Sm cations exhibit the +3 oxidation state. The unexpected initial growth in the A-Sm2O3 hexagonal phase and its gradual transition to a mixture with cubic C-Sm2O3 showcases the complexity of the system and the critical role of the substrate in the stabilization of the hexagonal phase, which was previously reported only at high pressures and temperatures for bulk samaria. Besides, these results highlight the potential interactions that Sm could have with other catalyticWe have used low-energy electron microscopy (LEEM), micro-illumination low-energy electron diffraction (µLEED) supported by ab initio calculations, and X-ray absorption spectroscopy (XAS) to investigate in-situ and in real-time the structural properties of Sm2O3 deposits grown on Ru(0001), a rare-earth metal oxide model catalyst. Our results show that samarium oxide grows in a hexagonal A-Sm2O3 phase on Ru(0001), exhibiting a (0001) oriented-top facet and (113) side facets. Upon annealing, a structural transition from the hexagonal to cubic phase occurs, in which the Sm cations exhibit the +3 oxidation state. The unexpected initial growth in the A-Sm2O3 hexagonal phase and its gradual transition to a mixture with cubic C-Sm2O3 showcases the complexity of the system and the critical role of the substrate in the stabilization of the hexagonal phase, which was previously reported only at high pressures and temperatures for bulk samaria. Besides, these results highlight the potential interactions that Sm could have with other catalytic compounds with respect to the here gathered insights on the preparation conditions and the specific compounds with which it interacts.show moreshow less

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Author: Emilia PożarowskaORCiD, Linus PleinesORCiD, Moritz EwertORCiD, Mauricio J. PrietoORCiD, Liviu Christian TănaseORCiD, Lucas de Souza CaldasORCiD, Aarti TiwariORCiD, Thomas SchmidtORCiD, Jens FaltaORCiD, Eugene KrasovskiiORCiD, Carlos MoralesORCiD, Jan Ingo FlegeORCiD
DOI:https://doi.org/10.1016/j.ultramic.2023.113755
ISSN:0304-3991
ISSN:1879-2723
Title of the source (English):Ultramicroscopy
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2023
Tag:Epitaxy; Facets; Hexagonal phase; Samarium oxide (Sm2O3); X-ray photoemission electron microscopy (XPEEM); low-energy electron microscopy (LEEM)
Volume/Year:250
EU-Project number / Contract (GA) number:Postdoc Network Brandenburg
Article number:113755
Fundername (not EU):Postdoc Network Brandenburg
Project number (not EU):PNB grant
Way of publication:Open Access
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Angewandte Physik und Halbleiterspektroskopie
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