Electronic structure and chemical bonding of nanocrystalline-TiC/amorphous-C nanocomposites
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, no 235108Article in journal (Refereed) Published
Theelectronic structure of nanocrystalline (nc-) TiC/amorphous C nanocomposites has beeninvestigated by soft x-ray absorption and emission spectroscopy. The measuredspectra at the Ti 2p and C 1s thresholds of the nanocompositesare compared to those of Ti metal and amorphous C.The corresponding intensities of the electronic states for the valenceand conduction bands in the nanocomposites are shown to stronglydepend on the TiC carbide grain size. An increased chargetransfer between the Ti 3d-eg states and the C 2p states hasbeen identified as the grain size decreases, causing an increasedionicity of the TiC nanocrystallites. It is suggested that thecharge transfer occurs at the interface between the nanocrystalline-TiC andthe amorphous-C matrix and represents an interface bonding which maybe essential for the understanding of the properties of nc-TiC/amorphousC and similar nanocomposites.
Place, publisher, year, edition, pages
2009. Vol. 80, no 235108
amorphous state, bonds (chemical), carbon, charge transfer states, composite material interfaces, conduction bands, crystallites, grain size, nanocomposites, titanium compounds, valence bands, X-ray absorption spectra, X-ray emission spectra
IdentifiersURN: urn:nbn:se:liu:diva-52162DOI: 10.1103/PhysRevB.80.235108OAI: oai:DiVA.org:liu-52162DiVA: diva2:280020
Original Publication: Martin Magnuson, Erik Lewin, Lars Hultman and Ulf Jansson, Electronic structure and chemical bonding of nanocrystalline-TiC/amorphous-C nanocomposites, 2009, Physical Review B. Condensed Matter and Materials Physics, (80), 235108. http://dx.doi.org/10.1103/PhysRevB.80.235108 Copyright: American Physical Society http://www.aps.org/2009-12-082009-12-082016-08-31