THERMAL TRANSPORT IN HARD CARBON PREPARED FROM C-60 FULLERENE

We report measurements of thermal conductivity in the 30-350 K range o f hard fullerene-based carbon. The material has been prepared by press ure-temperature treatment of C-60 fullerene. It shows an unusual combi nation of high hardness and relatively high electrical conductivity. I ts thermal conductivity is about 5.7 W mK(-1) at room temperature and decreases almost linearly in the investigated temperature range. Excel lent linearity in a wide temperature range may arise from some sort of crystalline order in the transformed substance. Obtained data are com pared with thermal properties of C-60. glassy carbon and diamond. The applicability of recent theoretical models for explanation of recorded data is discussed.