Complicated and Various Crystal Structures of Metal Sulfids

Abstract

Many kinds of complicated crystal structures have appeared in the transition metal sulfide system. Simulation by the matrix method could explain the diffuse scattering observed in nonstoichiometric titanium sulfides with stacking faults, in Ti_1.42S₂ with short-range order of Ti vacancies, and in some channel-type composite crystals such as Ba_0.7Cr₂S_3.7 with two-directional disorder of positions of filling columns. Crystal structures of incommensurate layered composite crystal (PbS) _1.12VS₂, columnar composite crystals Ba_10/9Fe₂S₄ and Ba_9/8Fe₂S₄, and incommensurate columnar composite crystals Sr_xTiS₃ (x=1.1-1.2) were successfully analyzed based on the superspace group approach.