Features of the Phase Preferences, Long- and Short-Range Order in Ln2(WO4)3 (Ln = Gd, Dy, Ho, Yb) with Their Relation to Hydration Behavior | Sciact - CRIS-system of Boreskov Institute of Catalysis

Features of the Phase Preferences, Long- and Short-Range Order in Ln2(WO4)3 (Ln = Gd, Dy, Ho, Yb) with Their Relation to Hydration Behavior Full article

Journal

Crystals
, E-ISSN: 2073-4352

Output data

Year: 2022, Volume: 12, Number: 7, Article number : 892, Pages count : 20 DOI: 10.3390/cryst12070892

Tags

lanthanoid tungstates; phase transitions; hydration; Synchrotron XRD; X-ray Absorption Fine Structure (XAFS); simultaneous thermal analysis; raman spectroscopy; FT-IR spectroscopy

Authors

Popov Victor V. ^1,2 , Zubavichus Yan V. ³ , Menushenkov Alexey P. ¹ , Yastrebtsev Alexey A. ¹ , Gaynanov Bulat R. ¹ , Rudakov Sergey G. ¹ , Ivanov Andrey A. ¹ , Dubyago Fyodor E. ¹ , Svetogorov Roman D. ² , Khramov Evgeny V. ² , Tsarenko Nadezhda A. ⁴ , Ognevskaya Nataliya V. ⁴ , Shchetinin Igor V. ⁵

Affiliations

1	Department of Solid State Physics and Nanosystems, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow
2	Kurchatov Synchrotron Radiation Source, National Research Center Kurchatov Institute, Moscow
3	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Koltsovo
4	JSC Design & Survey and Research & Development Institute of Industrial Technology, Moscow
5	Material Science Department, National University of Science and Technology MISiS, Moscow

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

075-15-2021-1352

The effect of synthesis conditions on the features of the long- and short-range order of Ln2(WO4)3 (Ln = Gd, Dy, Ho, Yb) powders synthesized via coprecipitation of salts has been studied by a complex of physico-chemical techniques including synchrotron X-ray powder diffraction, X-ray absorption spectroscopy, Raman and infrared spectroscopy, and simultaneous thermal analysis. It was found that crystallization of amorphous precursors begins at 600 C/3 h and leads to the formation of the monoclinic structure with sp. gr. C12/c1(15) for Ln2(WO4)3 (Ln = Gd, Dy) and with sp. gr. P121/a1(14) for Ln = Yb, whereas crystallization of Ho precursor requires even higher temperature. After annealing at 1000 C, the P121/a1(14) phase becomes the dominant phase component for all heavy lanthanoid types except for Ln = Gd. It was shown that the Ln (Ln = Dy, Ho, and Yb) tungstates with the P121/a1(14) monoclinic structure correspond to trihydrates Ln2(WO4)3 3H2O formed due to a rapid spontaneous hydration under ambient conditions. It was concluded that the proneness to hydration is due to a specific structure of the P121/a1(14) phase with large voids available to water molecules. Modifications in the local structure of Ln-O coordination shell accompanying the structure type change and hydration are monitored using EXAFS spectroscopy.

Popov V.V. , Zubavichus Y.V. , Menushenkov A.P. , Yastrebtsev A.A. , Gaynanov B.R. , Rudakov S.G. , Ivanov A.A. , Dubyago F.E. , Svetogorov R.D. , Khramov E.V. , Tsarenko N.A. , Ognevskaya N.V. , Shchetinin I.V.
Features of the Phase Preferences, Long- and Short-Range Order in Ln2(WO4)3 (Ln = Gd, Dy, Ho, Yb) with Their Relation to Hydration Behavior
Crystals. 2022. V.12. N7. 892 :1-20. DOI: 10.3390/cryst12070892 WOS Scopus РИНЦ ANCAN OpenAlex publication_identifier_short.sciact_skif_identifier_type

Submitted:	May 4, 2022
Accepted:	Jun 17, 2022
Published online:	Jun 23, 2022
Published print:	Jul 1, 2022

Web of science:	WOS:000831911900001
Scopus:	2-s2.0-85133124241
Elibrary:	49158104
Chemical Abstracts:	2022:1989631
Chemical Abstracts (print):	179:323696
OpenAlex:	W4283396014
publication_identifier.sciact_skif_identifier_type:	529

DB	Citing
Scopus	2
Elibrary	1
Web of science	1