THE LAYERED COMPOSITE CRYSTAL-STRUCTURE OF THE TERNARY SULFIDE, (SNS)1.15TAS2 SNTAS3

The crystal structure of a new type of ternary sulfide with a layered composite crystal structure, (SnS)1.15TaS2 was studied by the single c rystal X-ray diffraction method. The precession photograph of (SnS)1.1 5TaS2 revealed the composite diffraction patterns of C-centered orthor hombic SnS subsystem with a = 5.749(4) angstrom, b2 = 5.737(4) angstro m, c = 11.8755(24) angstrom and C-centered orthorhombic TaS2 subsystem with a = 5.750(4) angstrom, b1 = 3.308(3) angstrom, c = 23.760(5) ang strom. The structure analysis has shown that the C-centered TaS2 is th e disordered subsystem with the trigonal-prismatic sites formed by S a toms are statistically occupied by Ta atoms.