Tetragonal Stoichiometric Yttrium Diselenide
| Autor: | Ludmila N. Zelenina, Tamara P. Chusova, R. E. Nikolaev, B. M. Kuchumov, V. Yu. Komarov, Nina V. Podberezskaya, I. V. Korol’kov |
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| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Materials science chemistry.chemical_element Yttrium Inorganic Chemistry Crystal Tetragonal crystal system Crystallography symbols.namesake chemistry.chemical_compound chemistry Selenide Materials Chemistry symbols Physical and Theoretical Chemistry Raman spectroscopy Single crystal Diffractometer |
| Zdroj: | Journal of Structural Chemistry. 60:92-98 |
| ISSN: | 1573-8779 0022-4766 |
| DOI: | 10.1134/s0022476619010128 |
| Popis: | 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) A, b = 4.0061(6) A, c = 8.2576(19) A, 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) A, c = 8.267(2) A, V = 133.21(4) A3). 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. |
| Databáze: | OpenAIRE |
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