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The one-dimensionally disordered structure of the composite crystal of synthetic (LaS) 1.18 VS 2  has been determined based on the X-ray diffraction intensities collected by using monochromatized synchrotron radiation of wavelength 1.180 Å. The ordered (100) projection was refined based on 94 unique intensities collected on a diffractometer using Mo K α   radiation;  R  = 0.067,  R w   = 0.084. The structure consists of interleaved layers of LaS and VS 2 , each of them forming a substructure which can be described based on a  C -centred orthorhombic lattice with  a  1  = 5.705(1) Å,  b  = 5.828(1) Å,  c  = 22.32(2) Å and  Z  = 8 for LaS and  a  2  = 3.366(3) Å,  b  = 5.828(1) Å,  c  = 22.32(2) Å and  Z  = 4 for VS 2 . The  b  and  c  axes are common to both substructures.  D  x  = 4.806 Mg m −3 . The structure of the (100) projection is isotypic with that of the orthorhombic (PbS) 1.18 TiS 2 ; plane group  pgm ,  b ′ =  b /2,  c ′ =  c . The La and S atoms of LaS are arranged like Na and Cl in the NaCl structure. The V atom is surrounded by six S atoms octahedrally. The LaS layers are related to each other through a twofold screw axis parallel to [100] with a screw translation of ±0.32 a  1 , while the nearest VS 2  layers are coupled by a glide plane perpendicular to [001] with a glide translation of ±0.25 a  2 . Stochastic change of the signs causes a one-dimensional disorder.

Struktur des eindimensional fehlgeordneten Kompositkristalls (LaS) 1,18 VS 2