Abstract
The temperature dependence of the linear thermal expansion coefficient α(T) is investigated in the temperature range of 2.5 to 23K for two different CH4–C60 solutions in which CH4 molecules occupy 24 and 50% of the octahedral interstitial sites of the C60 lattice. In both cases, α(T) exhibits hysteresis, suggesting the existence of two types of orientational glass associated with these solutions. The temperature of the first-order phase transition between these two glasses is estimated, and the behavior of these two glasses is compared. The characteristic times of thermalization τ1, reorientation of the C60 molecules τ2, and of the phase transformation between the glasses τ′, are estimated for these solutions. Both the temperature dependence of α(T) and the characteristic thermalization time τ1 are found to have features near the phase transition temperature, and an explanation is put forward to explain these observed features.
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call