Local Structure of Zinc Impurity Centers in Lead Chalcogenides and Pb_(1-x)Sn_xTe Solid Solutions

摘要

The positions of zinc impurity atoms formed in lead chalcogenide lattices (PbS, PbSe, and PbTe) after the radioactive decay of ~(67)Cu and ~(67)Ga isotopes are defined by the positions of parent atoms. Therefore, stabilization of the zinc centers is possible both at the cation and interstitial sites. In both positions, the zinc centers are either electrically inactive or the impurity energy level has a low ionization energy and recharging of the impurity does not affect the isomeric shift of the Mossbauer spectrum. In zero-gap Pb_(1-x)Sn_xTe solid solutions, changes in local symmetry of the cation sites and in the electron density at these sites are not observed.