Interfacial energies of p-dichlorobenzene-succinonitrile alloy


Pehlivanoǧlu T., Böyük U., Keşlioǧlu K., Ülgen A., Maraşlı N.

Thermochimica Acta, vol.463, no.1-2, pp.44-52, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 463 Issue: 1-2
  • Publication Date: 2007
  • Doi Number: 10.1016/j.tca.2007.07.012
  • Journal Name: Thermochimica Acta
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.44-52
  • Keywords: organic materials, crystal growth, interfacial energy, grain boundary energy, thermal conductivity
  • Istanbul Gelisim University Affiliated: No

Abstract

The commercial purity para-dichlorobenzene (p-DCB) and succinonitrile (SCN) were purified using a columnar distillation system. Thin-walled specimen cells (60-80 μm thick) were fabricated and filled with the purified materials under the vacuum. 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 purified p-DCB and p-DCB-2.7 mole% SCN alloy were determined with the radial heat flow and Bridgman-type growth apparatuses. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient and solid-liquid interfacial energy of solid p-DCB in equilibrium with p-DCB-SCN monotectic liquid have been determined to be (6.1 ± 0.6) × 10-8 K m and (29.2 ± 4.4) × 10-3 J m-2. The grain boundary energy of p-DCB phase has been determined to be (54.6 ± 9.3) × 10-3 J m-2 from the observed grain boundary grooves. © 2007 Elsevier B.V. All rights reserved.