Abstract
By powder X-ray diffraction, energy dispersive microscopy, Raman spectroscopy, and X-ray crystallographic analysis a secondary phase obtained in the synthesis of sesquilateral yttrium selenide is studied. Results of micro- and spectroscopic techniques show that the composition of crystals is close in the ratio of components to Y:Se ∼1:2, the character of the Raman spectrum clearly indicating the stoichiometric composition of the studied crystal. Positions of strong diffraction reflections obtained from a single crystal are indexed in the unit cell with parameters a = 4.0132(6) Å, b = 4.0061(6) Å, c = 8.2576(19) Å, whose symmetry can be considered tetragonal within the systematic error of the method. Experimental material for the X-ray crystallographic analysis is obtained on an automated Bruker DUO diffractometer with MoKα radiation. The average structure is solved in the tetragonal symmetry (space group P4/nmm, a = 4.0141(6) Å, c = 8.267(2) Å, V = 133.21(4) Å3). In the experimental frames weak superstructural peaks are observed, which evidence a possible increase in unit cell parameters in accordance with the matrix 400/030/002 and the maintenance of the character of structure modulation described for the non-stoichiometric YSe2−x (x = 0.15) sample.
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Russian Text © 2019 N. V. Podberezskaya, V. Yu. Komarov, R. E. Nikolaev, T. P. Chusova, L. N. Zelenina, B. M. Kuchumov, I. V. Korol'kov.
Translated from Zhurnal Strukturnoi Khimii, Vol. 60, No. 1, pp. 98–105, January, 2019.
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Podberezskaya, N.V., Komarov, V.Y., Nikolaev, R.E. et al. Tetragonal Stoichiometric Yttrium Diselenide. J Struct Chem 60, 92–98 (2019). https://doi.org/10.1134/S0022476619010128
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DOI: https://doi.org/10.1134/S0022476619010128