Electronic structure and chemical bonding of nanocrystalline-TiC/amorphous-C nanocomposites
2009 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 80, no 23, 235108- p.Article in journal (Refereed) Published
The electronic structure of nanocrystalline (nc-) TiC/amorphous C nanocomposites has been investigated bysoft x-ray absorption and emission spectroscopy. The measured spectra at the Ti 2p and C 1s thresholds of thenanocomposites are compared to those of Ti metal and amorphous C. The corresponding intensities of theelectronic states for the valence and conduction bands in the nanocomposites are shown to strongly depend onthe TiC carbide grain size. An increased charge transfer between the Ti 3d-eg states and the C 2p states hasbeen identified as the grain size decreases, causing an increased ionicity of the TiC nanocrystallites. It issuggested that the charge transfer occurs at the interface between the nanocrystalline-TiC and the amorphous-Cmatrix and represents an interface bonding which may be essential for the understanding of the properties ofnc-TiC/amorphous C and similar nanocomposites.
Place, publisher, year, edition, pages
2009. Vol. 80, no 23, 235108- p.
Nanokomposit, RIXS, XES, XAS, TEY, TFY, XPS, XRD
Condensed Matter Physics Inorganic Chemistry
Research subject Physics; Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-111387DOI: 10.1103/PhysRevB.80.235108ISI: 000273228800029OAI: oai:DiVA.org:uu-111387DiVA: diva2:280927