Inelastic deformation of C-60 single crystals in the temperature range 80-300 k

The rate spectrum of small inelastic strains of the C-60 single crystal in the temperature range 80-300 K has been obtained with a precision laser int erferometer. It is revealed that the spectrum exhibits two large peaks in t he glass formation (90-100 K) and phase transition (250-260 K) ranges. A sm all strain acceleration is also observed at similar to 220 and 240 K. The f irst two maxima are attributed to the changes in strain resistance upon tra nsitions, and the strain acceleration at 220 and 240 K is associated with t he annealing of the defects formed upon rapid cooling of the crystal. It is demonstrated that the peak at 250-260 K broadens with an increase in the s tress. The spectrum of strain rates is compared with the calorimetric curve for the same single crystal. (C) 2000 MAIK "Nauka/Interperiodica".