The effect of defects, such as vacancies, interstitials, and Frenkel pairs, upon the lattice parameters of body-centered cubic crystals was simulated. A comparison of experimental data for PbSe, PbTe and SnTe films which had been irradiated with energetic  particles showed that the predominant type of defect in the chalcohen sub-lattice was the Frenkel pair.

D.M.Freik, J.P.Salii, G.D.Mateik, I.I.Perkatyuk, I.M.Lishchinskii, V.N.Kupchak: Kristallografiya, 1995, 40[5], 913-5 (Crystallography Reports, 1995, 40[5], 846-8)