Local Structure of Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Yb, Lu) Solid Solutions | Sciact - CRIS-system of Boreskov Institute of Catalysis

Local Structure of Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Yb, Lu) Solid Solutions Full article

Journal

Inorganic Materials
ISSN: 0020-1685 , E-ISSN: 1608-3172

Output data

Year: 2022, Volume: 58, Number: 4, Pages: 379-388 Pages count : 10 DOI: 10.1134/S0020168522040100

Tags

synchrotron X-ray diffraction, Raman spectra, fluorite-derived Yb(Lu)2TiO5-based solid solutions, local structure

Authors

Lyashenko L.P. ¹ , Shcherbakova L.G. ² , Kolbanev I.V. ² , Tartakovskii I.I. ³ , Maksimov A.A. ³ , Svetogorov R.D. ⁴ , Zubavichus Ya.V. ⁵

Affiliations

1	Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Noginskii raion, Moscow oblast, 142432 Russia
2	Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia
3	Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Noginskii raion, Moscow oblast, 142432 Russia
4	Kurchatov Institute National Research Centre, Moscow, 123182 Russia
5	Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Order–disorder structural transformations in xR2O3·(1 – х)TiO2 (R = Yb, Lu; х = 0.5–0.6) solid solutions with a highly imperfect fluorite-derived structure at 1600°C have been studied using monochromatic synchrotron X-ray diffraction and Raman spectroscopy. The results demonstrate that the synthesis process leads to the formation of two cubic phases identical in composition: a disordered fluorite-like (F) phase (Fm3m) and an ordered pyrochlore-like (P) phase (Fd3m), which is coherent with the disordered phase and consists of nanoscale (<100 Å) and nanocrystalline domains. The lattice parameters of these phases have been determined. The stability range of the solid solutions in the systems studied is 0.5 ≤ x ≤ 0.55. In the samples containing 0.55Yb2O3 and 0.5Lu2O3, the P-phase consists of nanodomains. The Raman spectra of the Yb2TiO5- and Lu2TiO5-based solid solutions contain broad bands at low and high frequencies, with peaks at 101, 175, 290, 346, 384, and 727 (115, 176, 320, and 745) cm–1, which correspond to the P- and F-phases, respectively. The formation of pyrochlore-like phases with different degrees of order in a fluorite matrix is due to the internal stress induced by the high density of structural defects in their unit cells. The materials obtained in this study have a large specific surface area and can be used as catalysts and catalyst supports.

Lyashenko L.P. , Shcherbakova L.G. , Kolbanev I.V. , Tartakovskii I.I. , Maksimov A.A. , Svetogorov R.D. , Zubavichus Y.V.
Local Structure of Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Yb, Lu) Solid Solutions
Inorganic Materials. 2022. V.58. N4. P.379-388. DOI: 10.1134/S0020168522040100 WOS Scopus РИНЦ AN OpenAlex

Ляшенко Л.П. , Щербакова Л.Г. , Колбанев И.В. , Тартаковский И.И. , Максимов А.А. , Светогоров Р.Д. , Зубавичус Я.В.
Локальная структура высокодефектных флюоритпроизводных твердых растворов на основе R2TiO5 (R = Yb, Lu)
Неорганические материалы. 2022. Т.58. №4. С.397-406. DOI: 10.31857/S0002337X22040108 РИНЦ

Submitted:	Dec 1, 2021
Accepted:	Jan 21, 2022
Published print:	Apr 1, 2022
Published online:	Jun 16, 2022

Web of science:	WOS:000812263200006
Scopus:	2-s2.0-85132102586
Elibrary:	48720033
Chemical Abstracts:	2022:1563810
OpenAlex:	W4282979283

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