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Furlan, Andrej
(författare)
Crystallization characteristics and chemical bonding properties of nickel carbide thin film nanocomposites [Elektronisk resurs]
- E-artikel/E-kapitelEngelska2014
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Publicerad:Institute of Physics Publishing (IOPP,Publicerad:2014
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LIBRIS-ID:22098425
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http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-110752uri
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urn:nbn:se:liu:diva-110752urn
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10.1088/0953-8984/26/41/415501doi
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Lu, Jun
(författare)
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Hultman, Lars
(författare)
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Jansson, Ulf
(författare)
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Magnuson, Martin
(författare)
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Linköpings universitetInstitutionen för fysik, kemi och biologi
(utgivare)
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Linköpings universitetTekniska högskolan
(utgivare)
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Del av/supplement till:channel record
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Ingår i:VärdpublikationJournal of Physics26:41, 415501-4155120953-8984
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