Some comparative thermodynamic characteristics of fullerite and various covalent elements

Measurements of the specific heat and elastic wave velocities for a C₆₀ fullerene sample treated at high pressure and temperature are used to estimate the Debye temperature and the function ΔC=C _p−C _v, and also to calculate the thermal expansion work in the ideal approximation. Similar calculations were made for graphite, diamond, silicon, germanium, and various refractory metals. The results were used to draw qualitative conclusions on the structural stability of a new material obtained from fullerene C₆₀ which possesses extremely high hardness. Fiz. Tverd. Tela (St. Petersburg) 40, 1387–1389 (July 1998)