Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9633554 | The Journal of Chemical Thermodynamics | 2005 | 15 Pages |
Abstract
The heat capacities of 1-bromoadamantane in the condensed state were measured in calorimeters of two types: an adiabatic vacuum calorimeter was used in the temperature range from (6 to 320) K and a differential scanning calorimeter of the heat bridge type - between T = (290 and 430) K. Three solid-to-solid phase transitions and fusion were found to occur in the mentioned temperature range. The thermodynamic parameters of the solid-to-solid phase transitions were determined by the adiabatic calorimetry and of the crII â crI transition and fusion - in the scanning calorimeter. The molar thermodynamic functions of 1-bromoadamantane in the crystalline and liquid states were obtained. The two-stage development of the orientational disorder in the crystalline phases up to the formation of the plastic crystals was established for the compound under study. Thermal behaviour of adamantane and 1-haloadamantanes and parameters of orientational disorder in their isotropic plastic crystals were discussed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Ala B. Bazyleva, Andrey V. Blokhin, Gennady J. Kabo, Andrey G. Kabo, Yauheni U. Paulechka,