Research output: Contribution to journal › Article › peer-review
Tetragonal Stoichiometric Yttrium Diselenide. / Podberezskaya, N. V.; Komarov, V. Yu; Nikolaev, R. E. et al.
In: Journal of Structural Chemistry, Vol. 60, No. 1, 01.01.2019, p. 92-98.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Tetragonal Stoichiometric Yttrium Diselenide
AU - Podberezskaya, N. V.
AU - Komarov, V. Yu
AU - Nikolaev, R. E.
AU - Chusova, T. P.
AU - Zelenina, L. N.
AU - Kuchumov, B. M.
AU - Korol’kov, I. V.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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 MoK α 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) Å 3 ). 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 YSe 2−x (x = 0.15) sample.
AB - 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 MoK α 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) Å 3 ). 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 YSe 2−x (x = 0.15) sample.
KW - synthesis of sesquilateral REE selenides
KW - X-ray crystallographic analysis
KW - yttrium polyselenides
KW - EARTH
KW - HIGH-PRESSURE SYNTHESIS
UR - http://www.scopus.com/inward/record.url?scp=85064945929&partnerID=8YFLogxK
U2 - 10.1134/S0022476619010128
DO - 10.1134/S0022476619010128
M3 - Article
AN - SCOPUS:85064945929
VL - 60
SP - 92
EP - 98
JO - Journal of Structural Chemistry
JF - Journal of Structural Chemistry
SN - 0022-4766
IS - 1
ER -
ID: 20043840