Van Laar technique for estimating melting points

The van Laar technique for estimating melting points. Tf can be obtained by extrapolation from the liquidus of alloy systems which contain a phase of structure by a technique originally suggested by van Laar (1908) but not considered seriously until resuscitated by Hume-Rothery and Raynor (1940). It is described succinctly in the following extract from their paper ... 

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