Dielectric properties of ZrN, NbC, and NbN as determined by electron-energy-loss spectroscopy.

Physical review. B, Condensed matter (Impact Factor: 3.66). 03/1985; 31(3):1244-1247. DOI: 10.1103/PhysRevB.31.1244
Source: PubMed

ABSTRACT The dielectric properties of ZrN, NbC, and NbN in the energy range from 1.5 to about 38 eV were determined using high-resolution, high-energy electron-energy-loss spectroscopy. The Kramers-Kronig-derived optical joint densities of states agree well with calculated joint densities of states for NbC and ZrN. The results are compared to the corresponding 3d compounds.

  • [Show abstract] [Hide abstract]
    ABSTRACT: The nonmetal K-absorption edges of ZrN, NbC and NbN have been studied using high-energy-electron-energy-loss-spectroscopy. These spectra reflect the densities of unoccupied states. They are compared to total densities of states which are calculated by the linearized augmented planewave (LAPW) method using results of previous self-consistent APW energy band calculations. Except for one peak in ZrN good agreement between theory and experiment is observed especially in peak position.
    Solid State Communications 08/1985; 55(8):675–677. DOI:10.1016/0038-1098(85)90231-5 · 1.70 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The electronic structure of hexagonal β-Nb2N and δ′-NbN, and cubic fcc δ-NbN, grown by magnetron sputtering, have been investigated by X-ray photoemission spectroscopy and ellipsometric measurements. The valence band (VB) energy distribution curves (EDC) of these nitrides significantly differ each from each other. The hybridized N2p–Nb4d bands of β-Nb2N originate a featureless peak centered at 6 eV below the Fermi level, those of the δ′-NbN are characterized by two narrow peaks centered at 5 eV and 6.5 eV. Striking changes are also observed in the EDCs near the Fermi level, these features are associated with the nearly metallic Nb4d states. The dielectrical function of these nitrides reveals structures near the screened plasma edge which correlate well with their associated electronic structure. The dielectric function spectra can be used in the phase identification of the hexagonal and fcc phases. Comparing hexagonal and fcc electronic structures, both β-Nb2N and δ′-NbN are more covalent that the cubic δ-NbN. The prominent covalent bonding in these hexagonal nitrides can be related to their higher hardness values compared to that of the cubic phase.
    Thin Solid Films 01/2006; 494(s 1–2):190–195. DOI:10.1016/j.tsf.2005.07.185 · 1.87 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Two-dimensional (2D) plasmons in the monolayer graphite formed on TiC(111) surface have been detected by using electron energy loss spectroscopy. The plasmon due to the intraband transition has shown a peculir dispersion proportional to a sqare root of the wave vector parallel to the surface in the energy region of 0 – 3 eV. In addition, the other branch appearing at high energies above 5.4 eV presumably originates from the longitudinal 2D plasmon due to the interband transition.
    Solid State Communications 08/1992; 83(8):581–585. DOI:10.1016/0038-1098(92)90656-T · 1.70 Impact Factor