Published online by Cambridge University Press: 15 February 2011
We have prepared a wide Ba1−xSrxCl1+yF1−y solid solution (0<x<0.25, −0.20<y<0.20) that has the BaClF structure without any sign of lattice distortion or ordering of the cations or of the anions other than that already present in BaClF. Furthermore, 119Sn Mossbauer spectroscopy shows that tin(ll) is present in this material in the form of Sn2+ ions instead of being covalently bonded Sn(ll) with a stereoactive lone pair of electrons, which is nearly always the case when the anions are small and strongly electronegative, like for F and Cl. The tin situation is similar to that observed in SnCl2.
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