The reflectivity of the compound Ga (1-x) Al x Sb has been measured at room temperature for different x, from 0.5 to 1.3 eV. The value of epsilon (o) has been calculated using the refractive index n=(1+ square root R)/(1- square root R). A non-linear composition dependence is reported. A model of calculation of epsilon (o) is proposed taking into account the energies of transitions E 0 and E 2 .
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Ance et al. (1976) studied this question.
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