Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface

Abstract To understand the atomistic phenomenon behind initial oxidation processes, we have studied the nanoscale evolution of oxide growth prior to the formation of a complete layer on a Ni–15 wt%Cr(100) alloy surface using scanning tunneling microscopy/spectroscopy (STM/STS). At the onset of oxida...

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Autores principales:	William H. Blades, Matthew R. Barone, Petra Reinke
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/5bb299a2e896416bbb020728ea0086f8
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spelling	oai:doaj.org-article:5bb299a2e896416bbb020728ea0086f82021-12-02T14:30:31ZInitial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface10.1038/s41529-021-00164-72397-2106https://doaj.org/article/5bb299a2e896416bbb020728ea0086f82021-04-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00164-7https://doaj.org/toc/2397-2106Abstract To understand the atomistic phenomenon behind initial oxidation processes, we have studied the nanoscale evolution of oxide growth prior to the formation of a complete layer on a Ni–15 wt%Cr(100) alloy surface using scanning tunneling microscopy/spectroscopy (STM/STS). At the onset of oxidation, a NiO superlattice forms oxide wedges across the step edges, eventually growing across the terraces. The completion of the NiO layer is followed by nucleation of the next layer, which always commences at the groove site of the superlattice. The Cr-oxide formation initiates as disk-shaped oxide particles early in the oxidation process, which Monte Carlo simulations reveal are likely caused by Cr clustering across the alloy surface. Upon further oxidation, a Cr(100)-p(2 × 2)O reconstructed surface is observed, indicating phase separation of Cr predicates the formation of the passive Cr-oxide film. The STS results vary across the oxide–alloy interface and between each oxide, providing greater insight into the origins of electronic heterogeneity and their effect on oxide growth. Using these data, we propose an oxidation model that highlights the growth of partial oxide layers on Ni–Cr(100) alloys within the pre-Cabrera–Mott regime.William H. BladesMatthew R. BaronePetra ReinkeNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 William H. Blades Matthew R. Barone Petra Reinke Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
description	Abstract To understand the atomistic phenomenon behind initial oxidation processes, we have studied the nanoscale evolution of oxide growth prior to the formation of a complete layer on a Ni–15 wt%Cr(100) alloy surface using scanning tunneling microscopy/spectroscopy (STM/STS). At the onset of oxidation, a NiO superlattice forms oxide wedges across the step edges, eventually growing across the terraces. The completion of the NiO layer is followed by nucleation of the next layer, which always commences at the groove site of the superlattice. The Cr-oxide formation initiates as disk-shaped oxide particles early in the oxidation process, which Monte Carlo simulations reveal are likely caused by Cr clustering across the alloy surface. Upon further oxidation, a Cr(100)-p(2 × 2)O reconstructed surface is observed, indicating phase separation of Cr predicates the formation of the passive Cr-oxide film. The STS results vary across the oxide–alloy interface and between each oxide, providing greater insight into the origins of electronic heterogeneity and their effect on oxide growth. Using these data, we propose an oxidation model that highlights the growth of partial oxide layers on Ni–Cr(100) alloys within the pre-Cabrera–Mott regime.
format	article
author	William H. Blades Matthew R. Barone Petra Reinke
author_facet	William H. Blades Matthew R. Barone Petra Reinke
author_sort	William H. Blades
title	Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
title_short	Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
title_full	Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
title_fullStr	Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
title_full_unstemmed	Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface
title_sort	initial atomic-scale oxidation pathways on a ni–15cr(100) alloy surface
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5bb299a2e896416bbb020728ea0086f8
work_keys_str_mv	AT williamhblades initialatomicscaleoxidationpathwaysonani15cr100alloysurface AT matthewrbarone initialatomicscaleoxidationpathwaysonani15cr100alloysurface AT petrareinke initialatomicscaleoxidationpathwaysonani15cr100alloysurface
_version_	1718391192375263232

Initial atomic-scale oxidation pathways on a Ni–15Cr(100) alloy surface

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