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Abstract
The nematic isotropic phase boundary and refractive indices of p-azoxyanisole (PAA), p, p'-di-n-pentyloxyazoxybenezen (PPAB) and their mixtures are reported. The shape of the phase boundary of the PAA/PPAB system is explained in terms of the mixture theory of Humphries and Luckhurst. The optical data are used to calculate the mean polarizability of the mixtures and to calculate the order parameters on the basis of Vuks description of the local field. It is seen that the mean polarizabilities and order parameters of the PAA/PPAB mixtures of follow the additive rule.