Effet Mössbauer de 119Sn dans les systèmes SnSBaS et SnSTl2S

Tin-119 Mössbauer spectra have been recorded at liquid nitrogen and room temperatures for ternary sulfides isolated from the systems SnSBaS and SnSTl₂S. The chemical isomer shifts observed (2.8 – 3.4 mm/sec relative to BaSnO₃ at 293 K) are characteristic of divalent tin compounds. The data are consistent with the known structures of these compounds and are discussed with regard to the stereochemical activity of the tin(II) lone pair of electrons. For Tl₂Sn₂S₃ and Tl₄SnS₃ the Mössbauer parameters are interpreted in terms of direct population of conductance bands by nonbonding electron pairs.