Abstract

High-sensitivity Fourier transform NMR spectroscopy has been used to detect possible local regions of low density and high mobility in two glassy crystals, 1-cyanoadamantane and cyclohexanol, for which secondary dielectric relaxations have been observed. It is shown that, in contradiction with the model of Pathmanathan and Johari (1985), all molecules contribute to the secondary relaxation. From both the static and the dynamic points of view, glassy crystals behave like statistically uniform materials.

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