Abstract
The freezing-in phenomena that occurred in some orientationally disorderedcrystals and liquid crystals, either in the metastable or in the stable state, aredescribed in comparison with those in liquids. These observations indicate clearlythat the glass transitions observed exclusively in liquids are just one example of‘transitions’ which must occur widely in condensed states of matter, irrespectiveof the structural regularity. The interplay between phase and glass transitions incrystals is discussed in relation to useful dopants that accelerate some molecularmotions resulting in failure to maintain equilibrium at low temperatures.The structural relaxation occurring in vapour-quenched amorphous solidsis studied using an adiabatic calorimeter operated as a low-frequencyspectrometer. The anomalous behaviour of the configurational entropyScobserved for some molecular systems is discussed. The solid-state vitrification ofmolecular crystals caused by mechanical milling and the formation of molecularalloys for some binary systems are described, with potential applications.
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