Curve defining the region of composition and temperature for a binary mixture across which a transition occurs from conditions where single-phase mixtures are @M03872@ to conditions where single-phase mixtures are @U06569@ and undergo @P04534@ by @S05869@.
  1. The spinodal curve for a binary mixture is defined as the geometrical locus of all states with \[\left ( \frac{\delta^{2}\Delta _{\text{mix}}G}{\delta\phi ^{2}} \right)_{T,p} = 0\].
  2. In the @U06569@ region bounded by the spinodal curve, @PT07286@ separation is spontaneous, i.e., no nucleation step is required to initiate the separation process.
PAC, 2004, 76, 1985. (Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)) on page 1998 [Terms] [Paper]