Compositions of phases in the interaction of rare-earth metals with selenium
| Autor: | V. B. Kharitontsev, O. V. Andreev, A. V. Elyshev |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Ytterbium
Exothermic reaction Scanning electron microscope Materials Science (miscellaneous) Analytical chemistry chemistry.chemical_element Isothermal process Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry Agglomerate Selenide Physical and Theoretical Chemistry Powder diffraction Selenium |
| Zdroj: | Russian Journal of Inorganic Chemistry. 58:910-914 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s0036023613080020 |
| Popis: | The interaction of rare-earth metals (Pr, Nd, Sm, Y, Er, and Yb) with selenium at Ln: Se = 1: 2, 2: 3, 3: 4, and 1: 1 under polythermal (293–1270 K) and isothermal (770 and 1170 K) heat treatment conditions was studied by differential thermal and X-ray powder diffraction analyses. While heating the reaction mixture, the exothermic events in the interaction between elements occur within the temperature ranges 620–750 K (Pr), 580–870 K (Sm), and 620–920 K (Er). X-ray powder diffraction analysis detected the formation of the following phases in the homogeneous state: at 770 K, LnSe2 and Yb2Se3, and at 1170 K, Ln3Se4, Ln2Se3, and YbSe. Scanning electron microscopy showed that particles of the selenide phases are formed by 1 × 2–5-μm fragments, which constitute a spongy structure of agglomerates tens to hundreds of micrometers in size. |
| Databáze: | OpenAIRE |
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