Melting reaction in the liquid state

This is a traditional, often used, method of synthesizing the intermetallic compound it consists in melting together the component metals and then cooling the molten mixture in order to crystallize the intermediate phase. 

The shape, the slope, of the liquidus line (or liquidus surface) is obviously an important point which has to be considered. 

An extreme case of diagram with high-melting temperatures is represented by the system ofAl (m.p. 660.5°C, b.p. 2520°C) with Re (m.p. 3186°C, b.p. 5596°C). Okamoto (2002) reviewed the literature concerning this system and underlined that the differences between two recently determined diagrams (from an evaluation of the thermodynamic properties and, respectively, by using several experimental 

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