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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.71: Poster
Monday, March 27, 2006, 14:00–17:45, P1
Thermal Conductivity of Solid Ethanol in the Three Polymorphous Phases — •Alexey Yushchenko, Alexander Krivchikov, Korolyuk Oksana, Gorodilov Boris, and Manzhelii Vadim — B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Solid ethyl alcohol can be obtained in three metastable
long-living phases - position glass, an orientationally-disordered
(static disorder) crystal (orientational glass) and a crystal with
dynamic orientational disorder. The orientationally - ordered
monoclinic - system crystal is the only thermodynamically
equilibrium solid phase of the alcohol.
In this work the
temperature dependence of the thermal conductivity of solid
ethanol was measured in all solid phases under equilibrium vapor
pressure at 2-159 K by the steady-state potentiometric method. The
glass phase was obtained by cooling the container with liquid
nitrogen at an extremely high rate (over 50 K/min). The
orientationally - disordered bcc crystal phase was formed on
hardening the slowly overcooled liquid at T = 125 K. An
orientationally - ordered crystal evolved in the process of rapid
crystallization provoked by heating the bcc phase to over 116 K.
The recrystallized sample was then annealed for several days at a
temperature close to the melting point.
Obtained data have been
analyzed in the borders of the soft potential model.