Thermal properties of halogen-ethane glassy crystals: Effects of orientational disorder and the role of internal molecular degrees of freedom

The Journal of Chemical Physics
G A VdovichenkoMiguel A Ramos

Abstract

The thermal conductivity, specific heat, and specific volume of the orientational glass former 1,1,2-trichloro-1,2,2-trifluoroethane (CCl2F-CClF2, F-113) have been measured under equilibrium pressure within the low-temperature range, showing thermodynamic anomalies at ca. 120, 72, and 20 K. The results are discussed together with those pertaining to the structurally related 1,1,2,2-tetrachloro-1,2-difluoroethane (CCl2F-CCl2F, F-112), which also shows anomalies at 130, 90, and 60 K. The rich phase behavior of these compounds can be accounted for by the interplay between several of their degrees of freedom. The arrest of the degrees of freedom corresponding to the internal molecular rotation, responsible for the existence of two energetically distinct isomers, and the overall molecular orientation, source of the characteristic orientational disorder of plastic phases, can explain the anomalies at higher and intermediate temperatures, respectively. The soft-potential model has been used as the framework to describe the thermal properties at low temperatures. We show that the low-temperature anomaly of the compounds corresponds to a secondary relaxation, which can be associated with the appearance of Umklapp processes, i.e., anharm...Continue Reading

References

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Nov 10, 2009·The Journal of Chemical Physics·Merzak HassaineMiguel A Ramos

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Citations

Oct 10, 2015·The Journal of Chemical Physics·Silvina C PérezJosep Lluis Tamarit
May 2, 2016·The Journal of Chemical Physics·P TripathiR Macovez
May 9, 2019·Physical Chemistry Chemical Physics : PCCP·A Vila-CostaJ Rodríguez-Viejo
Nov 17, 2017·The Journal of Chemical Physics·Nirvana B CaballeroPablo Serra
Mar 25, 2017·Physical Review Letters·A VispaJ Ll Tamarit
Feb 25, 2021·The Journal of Physical Chemistry Letters·Y MiyazakiJ Ll Tamarit

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