INFLUENCE OF MELT OVERHEATING NAPHTHALENE, DIPHENYL AND DIBENZYL ON CRYSTALLIZATION

• Main Authors: V.D. Aleksandrov, O.A. Pokyntelytsia
• Format: Article
• Language: Russian
• Published: Tver State University 2014-11-01
• Series: Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов
• Subjects: naphthalene; diphenyl; dibenzyl; thermal analysis; melt overheat; subcooling; equilibrium and nonequilibrium crystallization; crystal structure
• Online Access: http://physchemaspects.ru/archives/2014/%D0%A4%D0%A5-2014.%20%D0%90%D0%BB%D0%B5%D0%BA%D1%81%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B2%20%D0%92%D0%94.pdf
• ISSN: 2226-4442; 2658-4360

A sharp change in naphthalene, diphenyl, and dibenzyl crystallization behavior from the equilibrium without overcooling to the nonequilibrium-explosive with overheating was determined by thermoanalysis. The crystallization behavior depends on liquid phase overheating relative to the melting temperature. An average amount of the overheating that practically does not depend both on further overheating and number of heating – cooling cycles were calculated. A range of kinetic and thermodynamic parameters of crystallization was calculated using thermograms. By X-ray diffraction and optical microscopy changes in crystal structure were detected depending on the type of crystallization.