Crescimento e caracterização de liga eutetica sn-se

AUTOR(ES)
DATA DE PUBLICAÇÃO

1994

RESUMO

In many eutectic alloys. directional solidification is likely to resu1t in the formation of a fine anisotropic and regular structure of the lamellar or rod type. The development of specific microstructural characteristics depends upon the conditions at and the shape of the solid/liquid interface. To grow composite materiais from eutectic alloys is the main proposaI for research in this field. This work is concemed with the development of a directionally solidified Sn-Se eutectic using the Bridgman-Stockbarger method. The Sn-Se eutectic presents lamellar structure. Microstructure characterization was performed in order to evaIuate lamellar spacing, structure uniformity, phase composition. and semiconducting behavior. X-ray diffraction, opticaI and, scanning electron microscopy, four probe method, hot-probe, and Hall effect were used for the characterization. The analysed growing velocities (0.47cm/h to 3.07cm/h) and lamellar spacing uniformity have shown dependence on growing temperatures, components purity, and forced liquid convection. Also. varying lamellar spacing for the same growing conditions was an observed result. Liquid encapsulation technique showed improved microstructure uniformity. As the lamellar Sn-Se eutectic alloy forms multi/p-n/junctions, it is a potentiaI material for photovoltaic devices and some solar cell designs are proposed

ASSUNTO(S)

metalurgia

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