Dystectic composition

The maximum composition- existence range is given along with their dystectic composition, that is, the most usual composition. 

ITiis brings us to an important part of our discussion of stoichiometry of a crystal formed from a melt. As we have shown above, we can sometimes obtain a dystectic composition but most likely we will obtain a crystal containing "ordinary" types of defects. 

Due to the thermal dissociation of the complex compound AB, its liquidus curve exhibits a curvature at the temperature of fusion with a slope at the composition of AB equal to zero. Such a phenomenon is called the dystectic mode of melting (Figure 3.47). Thus at the temperature of fusion the following equation is fulfilled... 

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