Effects of Synthesis Conditions on the Crystal and Local Structures of High-Entropy Oxides Ln2M2O | Sciact - CRIS-system of Boreskov Institute of Catalysis

Effects of Synthesis Conditions on the Crystal and Local Structures of High-Entropy Oxides Ln2M2O Full article

Journal

Ceramics International
ISSN: 0272-8842

Output data

Year: 2024, Volume: 50, Number: 3, Part B, Pages: 5319-5335 Pages count : 17 DOI: 10.1016/j.ceramint.2023.11.283

Tags

High-entropy oxides (HEOs), Crystal and local structures, Phase transitions, Synchrotron XRD

Authors

Popov V.V. ^1,2 , Menushenkov A.P. ¹ , Yastrebtsev A.A. ¹ , Zubavichus Y.V. ³ , Gaynanov B.R. ¹ , Ivanov A.A. ¹ , Rudakov S.G. ¹ , Berdnikova M.M. ¹ , Pisarev A.A. ¹ , Kulikova E.S. ² , Khramov E.V. ² , Kolyshkin N.A. ² , Khrustalev V.N. ⁴ , Shchetinin I.V. ⁵ , Tatmyshevskiy M.K. ⁶ , Novikov S.M. ⁶ , Volkov V.S. ⁷ , Tsarenko N.A. ⁸ , Ognevskaya N.V. ⁸ , Seregina O.N. ⁸

Affiliations

1	National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409, Russia
2	National Research Center Kurchatov Institute, Moscow, 123182, Russia
3	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Koltsovo, 630559, Russia
4	RUDN University, Moscow, 117198, Russia
5	National University of Science and Technology MISiS, Moscow, 119049, Russia
6	Moscow Center for Advanced Studies, Moscow, 123592, Russia
7	Emerging Technologies Research Center, XPANCEO, Dubai Investment Park 1, Dubai, 607-0406, United Arab Emirates
8	JSC Design & Survey and Research & Development Institute of Industrial Technology, Moscow, 115409, Russia

The synthesis and detailed study of six series of high-entropy complex oxides containing lanthanides (Ln) and transition metals with the general formula LnMO (Ln = La-Yb, and Y; M = Ti, Zr, and Ce) with the number of different Ln cations not less than six in each case are reported. The influence of synthesis conditions (types of the Ln and M cations, calcination temperature) used in the synthesis via either coprecipitation or sol–gel method on the crystal and local structures of target materials is comprehensively surveyed. The studies were carried out using a combination of long- (s-XRD), medium- (Raman, FT-IR, SEM-EDS) and short-range (XAFS) sensitive techniques, as well as AES-ICP and STA. It was established that the ratio of the cation radii = is the main factor that determines the type of initially formed crystal structure. In the boundary region ( 1.42–1.47), the average radius of lanthanide cation (), along with the ratio, also plays a significant role in the type of the resulting crystal structure of the high-entropy lanthanide complex oxides. The presence of inhomogeneity in the distribution of elements in precursors significantly affects the phase composition of the resulting high-entropy oxides. An increase in the calcination temperature promotes not only the occurrence of subsequent phase transitions, but also an increase in the single-phase nature of the resulting high-entropy complex rare-earth oxides. At the same time, the cations included in the composition retain some independence, despite the fact that they occupy one crystallographic position in the resulting crystal structure.

Popov V.V. , Menushenkov A.P. , Yastrebtsev A.A. , Zubavichus Y.V. , Gaynanov B.R. , Ivanov A.A. , Rudakov S.G. , Berdnikova M.M. , Pisarev A.A. , Kulikova E.S. , Khramov E.V. , Kolyshkin N.A. , Khrustalev V.N. , Shchetinin I.V. , Tatmyshevskiy M.K. , Novikov S.M. , Volkov V.S. , Tsarenko N.A. , Ognevskaya N.V. , Seregina O.N.
Effects of Synthesis Conditions on the Crystal and Local Structures of High-Entropy Oxides Ln2M2O
Ceramics International. 2024. V.50. N3, Part B. P.5319-5335. DOI: 10.1016/j.ceramint.2023.11.283 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Sep 12, 2023
Accepted:	Nov 22, 2023
Published online:	Nov 24, 2023
Published print:	Feb 1, 2024

Web of science:	WOS:001145583500001
Scopus:	2-s2.0-85178324747
Elibrary:	65883473
Chemical Abstracts:	2023:2439749
OpenAlex:	W4388968614

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Scopus	2
Web of science	2