Multiscale Study on the Formation and Evolution of the Crystal and Local Structures in Lanthanide Tungstates Ln2(WO4)3 Научная публикация
| Журнал |
Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669 |
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| Вых. Данные | Год: 2022, Том: 910, Номер статьи : 164922, Страниц : 13 DOI: 10.1016/j.jallcom.2022.164922 | ||||||||||||
| Ключевые слова | Lanthanide tungstates, Crystal and local structure, Synchrotron XRD, X-ray absorption fine structure (XAFS), Raman spectroscopy, FT-IR spectroscopy | ||||||||||||
| Авторы |
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| Организации |
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Информация о финансировании (2)
| 1 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | 0718-2020-0037 |
| 2 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | 075-15-2021-1352 |
Реферат:
The influence exerted by the specific type of the lanthanide cation and calcination temperature on the crystal and local structures of Ln2(WO4)3 tungstates (Ln = La–Dy) prepared by a coprecipitation is studied using synchrotron X-ray diffraction, X-ray absorption fine structure (XAFS) spectroscopy, Fourier transform infrared (FT-IR) and Raman spectroscopies, photoluminescence, simultaneous thermal analysis, and inductively coupled plasma atomic emission spectroscopy. The combination of these experimental techniques enabled a structural insight into Ln tungstates at multiple characteristic scales, i.e. short-range of metal atom coordination (XAFS), medium-range of the network of chemical bonds (FT-IR and Raman spectroscopies), and long-range or 3D periodicity within crystallites (XRD). It is found that the onset of amorphous precursor crystallization is observed at 575–600 ∘C/3 h and leads to the formation of Ln2(WO4)3 nanocrystalline powders with a monoclinic (sp. gr. C12/c1 (15)) structure. An increase in the calcination temperature leads to the growth of crystallite size and a decrease in microstrains. In the case of Dy2(WO4)3 an additional orthorhombic phase emerges (sp. gr. Pbcn(60)) at 1000 ∘C. It is shown that the local structure of all well-crystallized compounds being studied contains lanthanide ions in the form of Ln3+ and tungsten ions in the form of WO tetrahedra. The local structure in the monoclinic phase can be represented as a superposition of two non-equivalent tungstate tetrahedra: W(1)O4 (C2 site symmetry) and W(2)O4 (C1 site symmetry). The LnO8 polyhedra are strongly irregular, and the Ln3+ cations occupy low-symmetry sites.
Библиографическая ссылка:
Popov V.V.
, Menushenkov A.P.
, Yastrebtsev A.A.
, Rudakov S.G.
, Ivanov A.A.
, Gaynanov B.R.
, Svetogorov R.D.
, Khramov E.V.
, Zubavichus Y.V.
, Molokova A.Y.
, Tsarenko N.A.
, Ognevskaya N.V.
, Seregina O.N.
, Rachenok I.G.
, Shchetinin I.V.
, Ponkratov K.V.
Multiscale Study on the Formation and Evolution of the Crystal and Local Structures in Lanthanide Tungstates Ln2(WO4)3
Journal of Alloys and Compounds. 2022. V.910. 164922 :1-13. DOI: 10.1016/j.jallcom.2022.164922 WOS Scopus РИНЦ CAPlusCA OpenAlex СКИФ ID
Multiscale Study on the Formation and Evolution of the Crystal and Local Structures in Lanthanide Tungstates Ln2(WO4)3
Journal of Alloys and Compounds. 2022. V.910. 164922 :1-13. DOI: 10.1016/j.jallcom.2022.164922 WOS Scopus РИНЦ CAPlusCA OpenAlex СКИФ ID
Даты:
| Поступила в редакцию: | 18 нояб. 2021 г. |
| Принята к публикации: | 5 апр. 2022 г. |
| Опубликована online: | 8 апр. 2022 г. |
| Опубликована в печати: | 25 июл. 2022 г. |
Идентификаторы БД:
| Web of science: | WOS:000797885700005 |
| Scopus: | 2-s2.0-85128206208 |
| РИНЦ: | 48428480 |
| Chemical Abstracts: | 2022:1026672 |
| Chemical Abstracts (print): | 179:18487 |
| OpenAlex: | W4224903323 |
| СКИФ ID: | 527 |