Structure of binary sulfides with D2h16 symmetry

CAS-PAN analysis for revealing close-packed crystallographic planes is performed to investigate the rs str structures of a series of binary chalcogenides containing heavy cations and having D-2h(16) symmetry with a short spacing perpendicular to the mirror plane. For chalcogenides with complex compositions, complex relationships between planes are typically observed. Absolute ordering of atoms by mirror planes generally coexists with ordering along the other two directions. By analogy with simple sulfides, these structures have cationic and anionic matrices of AA' type, that is, one-layer hexagonal packing of trigon nets with a base plane split into two planes and with a doubled number of sites with respect to the number of atoms.