Thermal conductivity of tetrahydrofuran hydrate
  The thermal conductivity of tetrahydrofuran hydrate has been measured in the temperature region 2 &#8211; 220 K by the steady-state potentiometric method. The temperature dependence of the thermal conductivity exhibits behavior typical of amorphous substances. It is shown that above 100 K the mean free path of the phonons is considerably smaller than the lattice parameter and is no longer dependent on temperature. 
A. I. Krivchikova, V.G. Manzheliia, O.A. Korolyuka, B.Ya. Gorodilova,   O.O. Romantsovaa (Institute for Low Temperature Phys...