J. Phys. IV France 7 (1997) C2-1159-C2-1160
Off-Centering of Pb and Sn Impurities in GeTe Induced by Strong Local StressA.I. Lebedev1, I.A. Sluchinskaya1, V.N. Demin1 and I.H. Munro2
1 Physics Department, Moscow State University, Moscow, 119899, Russia
2 CCLRC, Daresbury Laboratory, Warrington, WA4 4AD, UK
The local environment of large Pb and Sn substitutional impurities in GeTe was found to be strongly distorted compared to that in binary PbTe and SnTe compounds. For both impurities the neighboring Te atoms were found at two different distances, the shortest of them being by 0.16-0.17 Å less than that in corresponding binary compound. The off-centering of Pb and Sn impurities is explained by participation of their 6s2 and 5s2 unshared electron pairs in chemical bonding in the condition of strong local stress created by these impurities in the lattice.
© EDP Sciences 1997