Multiple glass transitions in vapor-deposited orientational glasses of the most fragile plastic crystal Freon 113

We investigate by fast-scanning nanocalorimetry the formation of Freon 113 films from the vapor phase at deposition temperatures ranging from 50-to-120 K, that is spanning above and below the transition temperature of the glassy crystal to the plastic crystal, (Tgc=72 K). Analysis of the heat capacity curves indicates that vapor deposition at TFreon 113 yields structural and orientational glasses in the as-deposited state depending on the temperature range of deposition. Interestingly, growing above Tgc produces plastic crystals with a conformational C1/Cs ratio that changes with Tdep above and below 110-120 K, the temperature at which previous works have identified the arrest of the transformations between the C1 and Cs conformers.