Effects Of Doping And Disorder
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. "Estudo do efeito da anarmonicidade e desordem induzida em filmes de GaAs1-xNx, por espectroscopia Raman"
Raman spectroscopy was used to investigate the vibrational properties in thermally treated and as grown thin films of GaAs1-xNx alloys, with 0,0144 ≤ ≤ 0,0370. Raman spectra exhibit the presence of two GaAs1-xNx characteristic modes. The redshift of the GaAs-like longitudinal-optic phonon (LO1) frequency and the blue shift of GaNlike longitudinal
Publicado em: 2010
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2. Magnetocaloric and barocaloric effects in Mn[As(1-x) Sb(x)] e La[Fe(x) Si(1-x)]13 / Efeitos magnetocalórico e barocalórico em Mn[As(1-x) Sb(x)] e La[Fe(x) Si(1-x)]13
Recent experimental data revealed that the compounds La[Fe(x)Si(1-x)]13 and Mn[As(1-x)Sb(x)], present great values for the isothermal entropy change and the adiabatic temperature change. They also showed that the magnetocaloric effect in these compounds can be easily tuned through doping and external pressure. Therefore, such experimental data, which need a
Publicado em: 2010
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3. Propriedades ópticas de nanocristais de SiGe: efeitos de dopagem e desordem
We have used ab initio calculations to investigate the electronic structure of SiGe based nanocrystals (NCs). This work is divided in three parts. In the first one, we focus the excitonic properties of Si(core)/Ge(shell) and Ge(core)/Si(shell) nanocrystals. We also estimate the changes induced by the effect of strain the electronic structure. We show that Ge
Publicado em: 2008
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4. Estrutura eletronica de polimeros conjugados : a influencia da desordem
The present work is dedicated to the theoretical study of effects observed in organic conjugated polymers in which disorder plays an important role. The following problems have been chosen for study: (1) Chemical reaction of polyanilines in acidic solutions. It is well known that protonation doping leads to insulator-to-metal transition in some forms of poly
Publicado em: 1992