Caracterização de ligas binárias nanoestruturadas dos sistemas Zn-Sb, Ge-Sb, Al-Sb e Co-Sb produzidas por síntese mecânica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Synthesis and study of nanostructured materials have generated great interest by the scientific point of view due to several new possibilities of technological applications. In this Doctoral thesis, nanostructured semiconductors with thermoelectric potential of Zn-Sb and Co-Sb systems, alloys of Al-Sb system and solid solutions of Ge-Sb system were produced. The physical properties at ambient and, in some cases at high pressure conditions, were studied by the following experimental techniques: x-ray diffraction and structural refinements using Rietveld method, photoacoustic spectroscopy, differencial scanning calorimetry, energy dispersive x-ray fluorescence, Raman and absorption x-ray spectroscopies at high pressures with diamond anvil cell. The nanostructured materials produced and presented in this thesis showed differences in their physical properties as compared to alloys of equal chemical composition produced by other techniques, both at ambient and high-pressure contitions. The influence of interfacial component in the physical properties of the nanostructured materials was evaluated and it was observed important changes in the thermal conductivity of the ZnSb, AlSb and CoSb3 alloys. In the case of the solid solutions, it was observed an increasing in the limit of solubility. In the high pressure tests, the interfacial component showed huge influence on the pressure-induced phase transitions, especially for ZnSb.

ASSUNTO(S)

nanoestrutura - materiais engenharia de materiais e metalurgica semicondutores

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