Fig. 3. (a) The layer structure of K1.92Sn3.04S7.04, (b) synthetic precession image of the (h5l) layer with the diffuse super cell reflections shown with arrows, and (c) [Sn3S7]2– layer with ideally ordered Sn and vacancy sites. Refinement suggests the presence of some Sn atoms in the vacant sites with fractional occupancy of 31.1(5)% due to the diffuse character of the supercell reflections.
