Self- and impurity diffusion in anthracene single crystals

Abstract

A radiotracer study of self- and impurity diffusion in anthracene single crystals of high purity has been made using anthracene-9-¹⁴C, anthraquinone-9-¹⁴C and HO³H as tracers. Lattice self-diffusion is best described by an equation of the form D₁= 1 × 10⁶ exp –(202 kJ mol^–1/RT) m² s^–1 and probably occurs by a vacancy mechanism.

Anthraquinone diffuses in a manner similar to the host. Water diffuses more rapidly but has a limited solubility in anthracene. It is concluded that bulk oxidation will be small and will have little effect on the evaluation of reliable self-diffusion coefficients.