The production of specimens of alloys in the GaSb-InSb system suitable for electrical and optical work is first discussed. X-ray data are given to show the variation in composition and the degree of homogeneity of specimen sections cut from long rod ingots produced by very slow directional freezing techniques. The results of measurements of infra-red transmission on such specimens are presented together with a graph of the variation of wavelength for onset of transmission, interpreted as optical energy gap, as a function of composition. The form of this graph is briefly discussed.
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Woolley et al. (1959) studied this question.
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