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Hidemoto NOJIMA**

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where *F*_{1} and *F*_{2} are fractions melted corresponding to the temperatures *t*_{1} and *t*_{2}; *t*_{0} is the temperature at the end of melting of the mixture, *i.e*. the liquidus temperature, which is equal to the temperature at *F*= 1 and *t*_{A} is the melting point of the pure component, respectively. The solid composition (*C*_{s}) equilibrium with the liquid phase at the temperature *t*_{0} is given by the product of the initial solute concentration (*C*_{0}) and *k*_{0} obtained by the above equation, *i.e*. *C*_{s}=*k*_{0}*C*_{0}. From the result of DSC for the samples containing about 0.5, 1.0 and 2.0 mass% of *p*-dibromobenzene in *p*-diiodobenzene and of *p*-diiodobenzene in *p*-dibromobenzene, the solidus and liquidus curves on both sides of the low concentrations in the phase diagram were estimated.

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