Measurement of solid–liquid interfacial energy in succinonitrile−pyrene eutectic system

Abstract The equilibrated grain boundary groove shapes for solid succinonitrile (SCN)–liquid SCN Pyrene (PY) were directly observed. From the observed grain boundary groove shapes, the Gibbs–Thomson coefficient for solid SCN in equilibrium with the SCN–PY eutectic liquid has been determined to be (5.21 ± 0.26) × 10− 8 K m with numerical method. The solid–liquid interface energy for the solid SCN in equilibrium with the SCN–PY eutectic liquid has been obtained to be (9.58 ± 0.96) × 10− 3 J m− 2 from the Gibbs–Thomson equation. The grain boundary energy of SCN rich phase of the SCN–PY system has been determined to be (18.30 ± 2.38) × 10− 3 J m− 2 from the observed grain boundary groove shapes. The thermal conductivity ratio of the liquid phase to the solid phase for SCN–3 mol% PY alloy has also been measured.

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