Epitaxial vanadium nanolayers to suppress interfacial reactions during deposition of titanium-bearing Heusler alloys on MgO(001)

Webster, R. W.H., Scott, M.T., Popuri, S.R., Bos, J.W.G. and MacLaren, D. A. (2020) Epitaxial vanadium nanolayers to suppress interfacial reactions during deposition of titanium-bearing Heusler alloys on MgO(001). Applied Surface Science, 512, 145649. (doi: 10.1016/j.apsusc.2020.145649)

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Abstract

Epitaxial growth of the half-Heusler alloy TiNiSn onto (1 0 0)-oriented MgO is compromised by interfacial reactions driven by the oxidising potential of titanium. Here, we demonstrate that a few epitaxial monolayers of elemental vanadium are sufficient to act as an impermeable buffer that maintains epitaxy and stoichiometric thin film growth but suppresses interfacial oxidation of the alloy. Electron diffraction and microscopy are used to characterise the thin film morphologies and thereby determine the optimum deposition conditions. Electron energy loss spectroscopy is used to demonstrate the chemical nature of the resulting thin film interfaces and confirms that TiNiSn film quality is improved.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:MacLaren, Dr Donald and Webster, Mr Robert
Authors: Webster, R. W.H., Scott, M.T., Popuri, S.R., Bos, J.W.G., and MacLaren, D. A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Surface Science
Publisher:Elsevier
ISSN:0169-4332
ISSN (Online):1873-5584
Published Online:04 February 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Applied Surface Science 512:145649
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172181Nanostructured half-Heuslers for thermoelectric waste heat recoveryDonald MaclarenEngineering and Physical Sciences Research Council (EPSRC)EP/N017218/1P&S - Physics & Astronomy
172865EPSRC DTP 16/17 and 17/18Tania GalabovaEngineering and Physical Sciences Research Council (EPSRC)EP/N509668/1Research and Innovation Services