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Crystallization characteristics and chemical bonding properties of nickel carbide thin film nanocomposites
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2837-3656
Uppsala University, Sweden .
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2014 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 26, no 41, 415501-415512 p.Article in journal (Refereed) Published
Abstract [en]

The crystal structure and chemical bonding of magnetron-sputtering deposited nickel carbide Ni1−xCx (0.05≤x≤0.62) thin films have been investigated by high-resolution x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy, Raman spectroscopy, and soft x-ray absorption spectroscopy. By using x-ray as well as electron diffraction, we found carbon-containing hcp-Ni (hcp-NiCy phase), instead of the expected rhombohedral-Ni3C. At low carbon content (4.9 at%), the thin film consists of hcp-NiCy nanocrystallites mixed with a smaller amount of fcc-NiCx. The average grain size is about10–20 nm. With the increase of carbon content to 16.3 at%, the film contains single-phase hcp-NiCy nanocrystallites with expanded lattice parameters. With a further increase of carbon content to 38 at%, and 62 at%, the films transform to x-ray amorphous materials with hcp-NiCy and fcc-NiCx nanodomain structures in an amorphous carbon-rich matrix. Raman spectra of carbon indicate dominant sp2 hybridization, consistent with photoelectron spectra that show a decreasing amount of C–Ni phase with increasing carbon content. The Ni 3d–C 2p hybridization in the hexagonal structure gives rise to the salient double-peak structure in Ni 2p soft x-ray absorption spectra at 16.3 at% that changes with carbon content. We also show thatthe resistivity is not only governed by the amount of carbon, but increases by more than a factor of two when the samples transform from crystalline to amorphous.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2014. Vol. 26, no 41, 415501-415512 p.
Keyword [en]
Amorphous nanocomposite nickel carbide XRD TEM XAS SAED
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-110752DOI: 10.1088/0953-8984/26/41/415501ISI: 000343423600004PubMedID: 25237716OAI: oai:DiVA.org:liu-110752DiVA: diva2:748649
Available from: 2014-09-20 Created: 2014-09-20 Last updated: 2017-12-05Bibliographically approved

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Furlan, AndrejLu, JunHultman, LarsMagnuson, Martin

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