Artículos de revistas
Identification of structural changes in carbon-nitrogen alloys by studying the dependence of the plasmon energy on nitrogen concentration
Registro en:
Applied Physics Letters. Amer Inst Physics, v. 73, n. 24, n. 3521, n. 3523, 1998.
0003-6951
WOS:000077402800014
10.1063/1.122823
Autor
Alvarez, F
dos Santos, MC
Hammer, P
Institución
Resumen
The effect of nitrogen on the valence-electron plasmon energy in amorphous carbon-nitrogen alloys (a-C1-xNx) is used to identify structural changes in the material. The samples were prepared by dual-ion-beam-assisted deposition and studied in situ by x-ray photoemission spectroscopy. The plasmon energy of the alloy goes through a maximum above 15-20 at.% nitrogen concentration. This behavior is correlated with structural changes obtained in a semiempirical quantum chemical calculation on graphite-like carbon clusters, randomly substituted by nitrogen. At that concentration, the geometry optimization shows that the graphite-like conformation is unstable against the buckling of the structure. (C) 1998 American Institute of Physics. [S0003-6951(98)02050-6]. 73 24 3521 3523