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Temperature Function of Birefringence and Structural Changes in Carbazole Crystal
Authors:Włodzimierz J. Kusto  Józef W. Rohleder
Affiliation:Institute of Organic and Physical Chemistry, Technical University , Wybrze?e Wyspiańskiego 27, 50-370, Wroc?aw, Poland
Abstract:With a modified quarter-wave Sénarmont compensator, exact measurements of the optical path difference have been carried out in (010) plates of carbazole, C12H9N, in the temperature range 20 < T < 190°C. At a temperature near 155°C distinct anomaly has been found corresponding to crystal-to-crystal phase transformation. The birefringence changes are discussed in terms of temperature dependence of density and orientation of molecules in the unit cell due to thermal expansion of the crystal.
Keywords:geometry of LC-molecules  mesogenic central methylene spacer  mesogenic cyclohexane derivatives
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