Abstract
Dielectric measurements have been made on glass-forming mixtures of decalin with chlorobenzene and decalin with tert-butylchloride, respectively. Whereas the temperature dependence of the α-relaxation is the same for both mixtures, the Johari β-relaxation strongly depends on the shape of the guest molecule. In the latter glass a huge β-peak is observed at about 50% of the temperature of the α-peak for a measuring frequency of 1 kHz. There seems to be a connection between this observation and the occurrence of a plastic crystalline phase in neat tert-butylchloride.
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