Study Influence of Doping on Temperature Dependence of Diffusion Rate in   Organic Molecular Crystals
  It is experimentally shown, that doping an organic molecular crystal reduces diffusion rate of impurity. Also reduces its influence on a modification of temperature. Examinations are lead on a crystal paradibromobenzene doping by paradiclorobenzene. Diffusing impurity was parabromochlorobenzene. 
M.A. Korshunov