The Crystal-Structure of Tetragonal Form Pbsnf4
Abstract We carried out single crystal X-ray diffraction measurement of tetragonal form PbSnF4: a=4.215 (3) A , c=11.744 (32) A , V=208.6 (5) A 3 , space group P4/nmm, z=2, and Dcalc=6.26 g/cm3. The structure was refined to wR=0.031 by the least-squares methods, using 132 reflections. The compound has the order arrangement of Pb and Sn metals constructing the sequence of …PbPbSnSnPbPb… along the c-axis direction. The fluorine ions in M2(Sn) cube were disordered in distorted tetrahedra. It is considerable that the disordered ions are related with the high ionic conductivity in PbSnF4.