Solid–liquid interfacial energy of solid succinonitrile solution in equilibrium with succinonitrile–neopentylglycol eutectic liquid

The grain boundary groove shapes for solid succinonitrile solution (SCN–5mole% NPG) in equilibrium with the succinonitrile (SCN)–neopentylglycol (NPG) eutectic liquid (SCN–9.55mole% NPG) have been directly observed by using a horizontal linear temperature gradient apparatus at 317.1K equilibrium temperature. From the observed grain boundary groove shapes, the Gibbs–Thomson coefficient (Г) and solid-liquid interfacial energy (σSL) of solid SCN solution have been determined to be (5.43±0.50)×10−8Km and (8.09±1.21)×10−3Jm−2, respectively. The grain boundary energy of solid SCN solution has been determined to be (14.22±2.28)×10−3Jm−2 from the observed grain boundary groove shapes. The thermal conductivity for SCN–9.55mole% NPG eutectic solid phase and the thermal conductivity ratio of eutectic liquid phase to eutectic solid phase at the melting temperature have also been measured with a radial heat flow apparatus and Bridgman type growth apparatus, respectively. •The grain boundary groove shapes for solid succinonitrile solution in the succinonitrile–neopentylglycol system were observed.•The Gibbs–Thomson coefficient and solid–liquid interfacial energy of solid succinonitrile solution have been determined.•The grain boundary energy of solid succinonitrile solution has been determined from the observed grain boundary groove shapes.