Crystal structure of novel R 3 Fe(Co, Ni) 0.5 SnS 7 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho) compounds
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ORIGINAL RESEARCH
Crystal structure of novel R3Fe(Co, Ni)0.5SnS7 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho) compounds Khrystyna Melnychuk 1 & Oleg Marchuk 1
&
Marek Daszkiewicz 2 & Lubomir Gulay 3
Received: 27 March 2020 / Accepted: 8 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The crystal structures of quaternary R3Fe0.5SnS7, R3Co0.5SnS7 and R3Ni0.5SnS7 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho) compounds of La3Mn0.5SiS7 structure type (space group P63, Pearson symbol hP23) were determined by X-ray single crystal and powder diffraction. R atoms occupy monocapped trigonal prisms; Fe(Co, Ni) atoms are located in octahedra, while Sn atoms are located in tetrahedra. Keywords Rare earth compounds . Chalcogenides . Crystal structure . X-ray single crystal . Diffraction
Introduction Chalcogenides of rare earth elements are capable of forming a significant number of compounds and multi-element phases that are characterized by a wide range of stoichiometric compositions and a variety of crystal structures. Most of these compounds belong to the quaternary chalcogenides of the general formula R3MexMe′X7 (R—rare earth element; Me, Me′—metal, metalloid; X = S or Se) containing the transition metals [1–20]. These chalcogenides are characterized by diverse physical properties because of noncentrosymmetric structure. For example, some of their representatives exhibit nonlinear optical properties or they are characterized by the phenomenon of photoconductivity [21–23]. Magnetic properties of quaternary phases La3MeAlS7 (Me = Mn, Fe, Co), La3MeInS7 (M = Fe, Co, Ni), R3MeGaX7 (Me = Fe, Co, Ni; X = S, Se) and R3Me0.5Me′Se7 (Me = Mn, Fe; Me′ = Si, Ge) were reported recently [24–26].
* Oleg Marchuk [email protected] 1
Department of Inorganic and Physical Chemistry, Eastern European National University, Voli Ave 13, Lutsk 43009, Ukraine
2
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna str. 2, P. O. Box 1410, 50-950 Wrocław, Poland
3
Department of Ecology and Protection of Environment, Eastern European National University, Voli Ave 13, Lutsk 43009, Ukraine
Previously, we reported on the results of the study of the crystal structure and magnetic properties of quaternary chalcogenides R3Mn0.5GeS7 (R = Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Er) [27], R3Fe0.5GeS7 (R = Y, La, Ce, Pr, Sm, Gd, Tb, Dy, Ho, Er and Tm) [28], R3Co0.5GeS7 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm) and R3Ni0.5GeS7 (R = Y, Ce, Sm, Gd, Tb, Dy, Ho, Er and Tm) [29]. In this paper, we present the crystal structure and characterization of thirty new quaternary chalcogenides R3Fe0.5SnS7, R3Co0.5SnS7 and R3Ni0.5SnS7 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho).
Experimental details Samples with the nominal compositions R3Me0.5SnS7 (Ме– Fe, Co, Ni; R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho) were prepared by solid-state syntheses carried out in resistance furnaces. The calculated amounts of the elemental constituents (their purity was better than 99.
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