MEASUREMENTS OF SOLID-LIQUID INTERFACIAL ENERGIES IN THE ORGANIC MONOTECTIC ALLOYS

Boyuk U., YÜCEER K., Keslioglu K., ÜLGEN A., Marasli N.

SURFACE REVIEW AND LETTERS, cilt.16, sa.2, ss.203-214, 2009 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 16 Sayı: 2
  • Basım Tarihi: 2009
  • Dergi Adı: SURFACE REVIEW AND LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.203-214
  • Anahtar Kelimeler: Organic materials, crystal growth, interfacial energy, grain boundary energy, thermal conductivity, CD EUTECTIC SYSTEM, SURFACE-ENERGY, PIVALIC ACID, AL-CU, SUCCINONITRILE, EQUILIBRIUM, METALS, ZN, PHASE, WATER
  • Erciyes Üniversitesi Adresli: Evet

Özet

The commercial purity dibromobenzene (DBB) and succinonitrile (SCN) were purified using a columnar distillation system. Thin walled rectangular specimen cells (60-80 mu m thick) were fabricated and filled with the purified materials under the vacuum. The specimen cell was placed in a horizontal temperature gradient stage. A thin liquid layer was melted and the specimen was annealed in a constant temperature gradient for an enough time to observe the equilibrated grain boundary groove shapes. The thermal conductivities of solid and liquid phases for the purified DBB and DBB-5.7mol% SCN alloy were determined with the radial heat flow and the Bridgman-type growth apparatuses. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficients, solid-liquid interfacial energies, and the grain boundary energies for solid DBB in equilibrium with its melts and solid DBB in equilibrium with DBB-SCN monotectic liquid have been determined. The temperature coefficients of the purified DBB and DBB-5.7mol% SCN alloy were also determined from thermal conductivity curve vs temperature.