https://doi.org/10.1351/goldbook.ST07274

Curve defining the region of composition and temperature for a binary mixture across which a transition occurs from conditions where single-phase mixtures are metastable to conditions where single-phase mixtures are unstable and undergo phase separation by spinodal decomposition.**Notes: **

*Source: *

PAC, 2004,*76*, 1985. 'Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)' on page 1998 (https://doi.org/10.1351/pac200476111985)

- The spinodal curve for a binary mixture is defined as the geometrical locus of all states with \[\left ( \frac{\delta^{2}\Delta _{\text{mix}}G}{\delta\phi ^{2}} \right)_{T,p} = 0\].
- 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,