Navegando por Autor "Marques, F. C."
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Artigo Vibrational properties of amorphous Si-N and Ge- N alloys(IOP Publishing Ltda, 1989) Carriço, Artur da Silva; Barrio, R. A.; Marques, F. C.; Sanjurjo, J.; Chambouleyron, I.A theoretical study of the vibrational density of states of amorphous alloys was developed by applying a simple effective-medium theory with a Born Hamiltonian. This theory is equivalent to the coherent-potential approximation, with the advantage that it is set in real space in a very simple way. With this theory, one can observe the differences in the spectra of amorphous Si and Ge when several concentrations of N atoms are added. The predictions of the theory are compared with data from Raman scattering experiments.