Determination of the Cationic Arrangement in Sn₂F₆ from neutron powder diffraction

Abstract

Abstract A structural determination of the high‐temperature form γ‐Sn 2 F 6 has been performed using neutron diffraction. This mixed fluoride exhibits the cubic ordered ReO 3 ‐type structure (Fm 3 m space group) with a = 8.321(4) Å at 497 K. The bond lengths Sn II F and Sn IV F give evidence of the presence of tin(II) in the (a) site and tin(IV) in the (b) site. A cationic ordering has also been found in the intermediate form β‐Sn 2 F 6 whose structure is related to the LiSbF 6 ‐type.