Control over fine scale terrace structures induced on polycrystalline Pd by simple heat treatments in air
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Publication Date
2017-10-15Journal Title
Surface and Coatings Technology
ISSN
0257-8972
Publisher
Elsevier
Volume
326
Issue
Part A
Pages
327-335
Type
Article
This Version
VoR
Metadata
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Sobral, J., Clyne, B., Rezk, R., & Markaki, A. (2017). Control over fine scale terrace structures induced on polycrystalline Pd by simple heat treatments in air. Surface and Coatings Technology, 326 (Part A), 327-335. https://doi.org/10.1016/j.surfcoat.2017.07.071
Abstract
This paper presents information about the formation of terraces (often composed of relatively wide faces and relatively narrow steps between them) on samples of polycrystalline palladium. These have been formed via simple heat treatments, involving holding at 1200˚C for periods ranging from a few minutes to several hours, followed by quenching by jets of inert gas. These treatments are such that the terraces are created, and survive the cooling, without significant formation of surface oxide. The crystallographic anisotropy of the surface energy is the driving force for terrace formation, with low surface energy planes tending to be preferentially exposed. Information is presented regarding the surface topography of the terraces and of the grain boundary regions, which have mainly been explored using AFM. Typically, the step heights are of the order of 50 nm and the widths of the faces between them are around 1 µm, although there are quite substantial local variations in these figures. It is shown that a degree of control is possible via the grain structure and texture of the sample, as well as via the processing conditions during the terracing treatment.
Keywords
Terraces, Palladium, Surface oxide, Surface energy anisotropy, AFM
Sponsorship
This research was supported by the EPSRC (EP/E025862/1) and the European Research Council (Grant No. 240446). Financial support for RR was provided by the Nabaa El Mahabaa, Egypt (ID 5898).
Funder references
EPSRC (EP/C011112/1)
European Research Council (240446)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (707684)
Identifiers
External DOI: https://doi.org/10.1016/j.surfcoat.2017.07.071
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267499
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International
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