Measurements of solid-liquid interfacial energies in the organic monotectic alloys


Böyük U., YÜceer K., Keǧlu K., Ulgen A., MARAŞLI N.

Surface Review and Letters, vol.16, no.2, pp.203-214, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 16 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1142/s0218625x09012500
  • Journal Name: Surface Review and Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.203-214
  • Keywords: Organic materials, crystal growth, interfacial energy, grain boundary energy, thermal conductivity
  • Istanbul Gelisim University Affiliated: No

Abstract

The commercial purity dibromobenzene (DBB) and succinonitrile (SCN) were purified using a columnar distillation system. Thin walled rectangular specimen cells (60-80 μm 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-5.7 mol% 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-5.7 mol% SCN alloy were also determined from thermal conductivity curve vs temperature. © 2009 World Scientific Publishing Company.