Journal of Crystal Growth, vol.338, no.1, pp.181-188, 2012 (SCI-Expanded)
The grain boundary groove shapes for equilibrated solid neopentylglycol (NPG) solution (NPG3 mol% D-camphor) in equilibrium with the NPGDC eutectic liquid (NPG36.1 mol% D-camphor) have been directly observed using a horizontal linear temperature gradient apparatus. From the observed grain boundary groove shapes, the GibbsThomson coefficient (), solidliquid interfacial energy (σ SL) of NPG solid solution have been determined to be (7.5±0.7)×10 -8 K m and (8.1±1.2)×10 -3 J m -2, respectively. The GibbsThomson coefficient versus T mΩ 1/3, where Ω is the volume per atom was also plotted by linear regression for some organic transparent materials and the average value of coefficient (τ) for nonmetallic materials was obtained to be 0.32 from graph of the GibbsThomson coefficient versus T mΩ 1/3. The grain boundary energy of solid NPG solution phase has been determined to be (14.6±2.3)×10 -3 J m -2 from the observed grain boundary groove shapes. The ratio of thermal conductivity of equilibrated eutectic liquid to thermal conductivity of solid NPG solution was also measured to be 0.80. © 2011 Published by Elsevier B.V. All rights reserved.