What is the Limit of Solubility

It is defined in terms of a solution which is a homogeneous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility [84]. 

Summarizing the definitions, one can say that, from the common point of view, the solubility (or solubility limits) and equilibrium compositions after the transition in bulk material coincide [63, 83, 84]. They are given by solidus and liquidus. In nanosystems, this is far from being true. Thus, the notions solidus and liquidus have to be reexamined when dealing with nanoparticles. 

We want to outline here the definition of solubility diagram and separate it from the definition of phase diagram which is now transformed into the nanophase diagram. Strictly speaking, the phase diagram is split, so the definitions should be split as well [81]. 

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