Abstract
Due to their underlying lattice and the orientational character of their glass transition, glassy crystals are very suitable systems to investigate the basic mechanism of the glass transition itself. Here, some structural, dynamical and non-equilibrium properties of the cyanoadamantane (CNa) glassy crystal are reviewed. In particular the molecular motions involved in the glass transition are characterized. Moreover, structural relaxations around the glass transition temperature, T g, are detected and studied through real-time X-ray experiments on single crystals. They show an anomalously weak time dependence which is tentatively understood through a Monte Carlo simulation. This calculation suggests that steric hindrance makes the ordering process an activated one, which ultimately leads to a freezing-in of the structure at low enough temperature.
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