A study of the isotope-mass-effect in self-diffusion has confirmed that the mobile point defect in crystalline naphthalene is a lattice vacancy. Subsequent examination of the effect of hydrostatic pressure on self-diffusion shows that the activation volume for vacancy self-diffusion in this solid is 1.2 Ω, where Ω is the molar volume of the solid.
E. M. Hampton and J. N. Sherwood, J. Chem. Soc., Faraday Trans. 1, 1975, 71, 1392 DOI: 10.1039/F19757101392
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