Self-Diffusion in the Molecular Crystal Adamantane; Comparison of NMR and Plastic-Flow Methods
- 27 May 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 20 (22) , 1227-1228
- https://doi.org/10.1103/physrevlett.20.1227
Abstract
Ultraslow-motion NMR and plastic-flow-rate techniques, both applied here for the first time to diffusion in a molecular crystal, each yield an activation enthalpy for self-diffusion of ∼36 kcal/mol. Mechanical properties of so-called plastic crystals have long been considered anomalous, but the relation between diffusion and plastic flow shown here renders the creep properties as well understood as those in metals.Keywords
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