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Low-temperature heat capacity of 1-bromoperfluorooctane

โœ Scribed by R.M. Varushchenko; A.I. Druzhinina; E.L. Sorkin

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
232 KB
Volume
29
Category
Article
ISSN
0021-9614

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โœฆ Synopsis

The heat capacities of crystalline and liquid 1-bromoperfluorooctane, Br(CF2)7CF3, were measured by a full-automatic adiabatic calorimeter in the temperature range from 5 K to 346 K. The calorimeter, experimental procedure and results of testing the apparatus by standard substances (copper and heptane) were described. 1-Bromoperfluorooctane was found to be capable of existing in metastable and stable solid forms. Two solid-to-solid transitions at the temperatures 146.4 K and 179.5 K, and a fusion at T = 278.90 K have been discovered. The enthalpies and entropies of phase transitions, as well as the main thermodynamic functions 4Gยฐ(T) -Hยฐ(0)5/T, 4Hยฐ(T) -Hยฐ(0)5/T and 4Sยฐ(T) -Sยฐ(0)5, have been determined. The Gibbs free energy of formation of the substance under study was determined on the basis of these experimental data and the enthalpy of formation estimated by means of the Benson and Buss group additivity method.

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