Phase Diagram Study of Succinonitrile-Vanillin Organic Alloy System

Abstract

Phase diagram studies of succinonitrile-vanillin system show the formation of 2:1 congruent melting type compound. Crystallization velocities of pure components, succinonitrile-vanillin complex, and two eutectics have been determined at different undercoolings. On the basis of heat of fusion measurements, excess thermodynamic functions have been calculated. Microstructural studies revealed that impurities modify the morphology. FTIR spectral studies and computer simulation have shown the existence of hydrogen bonding in the eutectics and the congruent melting compound.On the basis of experimental results, the mechanism of formation of eutectics and its solidification behavior are discussed.

Solidification and thermodynamic parameters of binary faceted organic alloys: Picric acid–Resorcinol system

“…The data followed Hillig-Turnbull [23] relationship, where the linear velocity of crystallization (v) and undercooling (ΔT) are related as follows [24]:…”