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Dielectric properties of 1-cyanoadamantane C10H15CN are analysed with very low frequencies between 80 K and 320 K. The critical frequency in the (stable and supercooled) plastic phases does not follow an Arrhenius law. This behaviour corresponds to the glassy state of cyanoadamantane. However, β relaxation in the glassy phase certainly does not exist in this compound.
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Amoureux et al. (1984) studied this question.
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