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

R. W. H. Webster; M. T. Scott; S. R. Popuri; J. W. G. Bos; D. A. Maclaren

doi:10.1016/j.apsusc.2020.145649

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

R. W. H. Webster, M. T. Scott, S. R. Popuri, J. W. G. Bos, D. A. Maclaren

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

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Abstract

Epitaxial growth of the half-Heusler alloy TiNiSn onto (100)-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.

Original language	English
Article number	145649
Journal	Applied Surface Science
Volume	512
Early online date	4 Feb 2020
DOIs	https://doi.org/10.1016/j.apsusc.2020.145649
Publication status	Published - 15 May 2020

Keywords

Contact layer
Epitaxy
Half-Heuslers
TEM
Thermoelectric
Thin-fim

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

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abstract = "Epitaxial growth of the half-Heusler alloy TiNiSn onto (100)-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.",

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AU - Scott, M. T.

AU - Popuri, S. R.

AU - Bos, J. W. G.

AU - Maclaren, D. A.

PY - 2020/5/15

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N2 - Epitaxial growth of the half-Heusler alloy TiNiSn onto (100)-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.

AB - Epitaxial growth of the half-Heusler alloy TiNiSn onto (100)-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.

KW - Contact layer

KW - Epitaxy

KW - Half-Heuslers

KW - TEM

KW - Thermoelectric

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M3 - Article

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

Abstract

Keywords

ASJC Scopus subject areas

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