Solid solubility
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often used in the field of metallurgy to refer to extent that an alloying element will dissolve into the base metal without forming a separate phase. The Solubility Line (or curve) is the line (or lines) on a phase diagram which give the limits of solute addition. That is, the lines show the maximum amount of a component that can be added to another component and still be in solid solution.
In microelectronic fabrication, solid solubilty refers to the maximum concentration of impurites one can can place into the subrate.

