Oleg МARCHUK, Оleksandr SMITIUKH
Ivan Franko Lviv National University, Kyryla and Mefodiya Str., 6, 79005 Lviv, Ukraine
DOI: https://doi.org/10.37827/ntsh.chem.2021.66.134
CRYSTAL STRUCTURE OF SULFIDES R3Co(Ni)0.5SiS7 (R – Ce, Pr)
Samples with the nominal compositions Ce(Pr)3Co(Ni)0.5SiS7 were prepared by fusion of the high-purity elemental constituents in evacuating silica ampoules. The purity of the starting materials was better than 99.9 wt. %. The crystalline structure of sulfides Ce3Co0.5SiS7 (a = 1.01283(6) nm; c = 0.57005(4) nm, RI = 0.0622, Rp = 0.2309), Ce3Ni0.5SiS7 (a = 1.01860(5) nm; c = 0.57151(4) nm, RI = 0.0652, Rp = 0.2449), Pr3Co0.5SiS7 (a = 1.01977(7) nm; c = 0.57237(5) nm, RI = 0.0418, Rp = 0.1861) and Pr3Ni0.5SiS7 (a = 1.01146(3) nm; c = 0.57004(3) nm, RI = 0.0548, Rp = 0.2206) was investagated by X-ray powder method (CuKα radiation, 10° ≤ 2θ ≤ 100°, step scan mode with a step size of 0.05° and a counting time of 20 s per data point). The studied compounds belong to the structure type La3Mn0.5SiS7 (PS hP23, SG P63). The crystal structure of Ce3Co0.5SiS7, Pr3Co0.5SiS7, Ce3Ni0.5SiS7, and Pr3Ni0.5SiS7 compounds was calculated by using the WinCSD software package. The atoms of сerium (praseodymium) occupy the 6c site and locate in trigonal prisms with two additional atoms. The atoms of cobalt (nickel) occupy the site 2a, in which they have octahedral surrounding of sulfur atoms respectively. The site occupancy factors of the atoms Co(Ni) are refined to values close to 0.50 for all the investigated compounds. In the final cycles, the occupancy factors of the Co(Ni) sites were fixed to 0.50 to satisfy charge balance requirements. The Si atoms occupy the site 2b and are at the center of the tetrahedral [SiS4]. The tetrahedral series, which are formed by polyhedrals of atoms Si in a two-dimensional plane ab along the x-axis, is one of the most important features of the structure of Ce(Pr)3Co0.5SiS7 compounds. Octahedrals which are centered by Co(Ni) atoms build chains [Co(Ni)S6]n. The R – S atomic distances increase if we change atom Ce to Pr. The same situation is observed if we change atom Co to Ni. Basically, atoms which have bigger atomic radii lead to increasing of cell units. According to the crystal structure of the obtained Ce(Pr)3Co0.5SiS7 compounds, they may possess non-linear properties, and they are the prospective materials to materials science. The compounds may also possess magnetic properties as a consequence of the distribution of R3+ at the site 6c and atoms Co at the site 2a.
Keywords: quaternary sulfides, rare-earths, crystal structure, X-ray powder diffraction.
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How to Cite
МARCHUK O., SMITIUKH O. CRYSTAL STRUCTURE OF SULFIDES R3Co(Ni)0.5SiS7 (R – Ce, Pr). Proc. Shevchenko Sci. Soc. Chem. Sci. 2021 Vol. LXVI. P. 134-141.