Abstract
Upon room temperature exposure to Cl 2 (or Br 2, or I 2), Sn 2+ Mössbauer dopant located on the surface of antiferromagnetic Cr 2O 3 microcrystals is readily oxidized. In the case of Cl 2 at least, primary local environment of resulting Sn 4+, with mixed anionic surrounding (O + Cl), is unstable at this temperature. After stabilization, part of the Sn 4+ ions remain in the topmost cationic layer, with pure oxygen coordination and magnetically active cationic surrounding. The other Sn 4+ are found completely isolated from the magnetic substrate by their anionic environment which uniquely involves chloride ions.
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