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1 Journal of Education and Technical Sciences

1 2015

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Thermal transport in molecular crystals of 1-cyanoadamantane

Szewczyk D., Jeżowski A.

Journal of Education and Technical Sciences

2015

Vol. 2, nr 1

22--23

The heat capacity and thermal conductivity measurements of 1-cyanoadamantane samples were carried out for temperatures between 2 K and 225 K. Particular polymorphic states were obtained due to different thermal treatment made on samples. The heat capacity for both phases (monoclinic and glass-like) seems to be equivalent to each other below 75 K. The absence of linear temperature dependence of heat capacity at lowest temperatures for glass-like state results probably from insufficient measurement range. For monoclinic phase one can determine jump in heat capacity values at around 200 K, which is connected with the shift of phase transition between monoclinic and supercooled metastable cubic phase. Thermal conductivity measurements enabled to observe besides monoclinic and glass-like also few metastable states. Results obtained from monoclinic phase resembles the behavior of dielectric crystals with an exception of low temperature power dependency, T2.69 instead of T3. Glass-like phase results imitate curves typical for amorphous materials, only the characteristic plateau is shifted towards higher temperatures and broader than usual.