Order–Disorder Structural Transformations in Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Tm, Er) Solid Solutions Full article
Journal |
Inorganic Materials
ISSN: 0020-1685 , E-ISSN: 1608-3172 |
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Output data | Year: 2020, Volume: 56, Number: 2, Pages: 190-197 Pages count : 7 DOI: 10.1134/s0020168520020119 | ||||||||
Tags | synchrotron X-ray diffraction; Raman spectra; Tm2TiO5 and Er2TiO5 fluorite derivatives; local structure | ||||||||
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Abstract:
Order–disorder structural transformations in xR2O3 ∙ (1 – х)TiO2 (R = Tm, Er; 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. In the stability range of the solid solutions ((0.5 ≤ x ≤ 0.6)), the lattice parameter of the fluorite-like phases follows Vegard’s law. The Raman spectra of the R2TiO5-based (R = Tm, Er) solid solutions contain broad bands at low and high frequencies, with peaks at 100, 171, 291, 355, 385, and 723 cm–1 for R = Tm and at 100, 169, 292, 355, 390, and 720 cm–1 for R = Er, 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.
Cite:
Lyashenko L.P.
, Shcherbakova L.G.
, Tartakovskii I.I.
, Maksimov A.A.
, Svetogorov R.D.
, Zubavichus Y.V.
, Kolbanev I.V.
Order–Disorder Structural Transformations in Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Tm, Er) Solid Solutions
Inorganic Materials. 2020. V.56. N2. P.190-197. DOI: 10.1134/s0020168520020119 WOS Scopus РИНЦ
Order–Disorder Structural Transformations in Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Tm, Er) Solid Solutions
Inorganic Materials. 2020. V.56. N2. P.190-197. DOI: 10.1134/s0020168520020119 WOS Scopus РИНЦ
Original:
Ляшенко Л.П.
, Щербакова Л.Г.
, Тартаковский И.И.
, Максимов А.А.
, Светогоров Р.Д.
, Зубавичус Я.В.
, Колбанев И.В.
Структурные преобразования порядок–беспорядок в высокодефектных флюоритпроизводных твердых растворах на основе R2TiO5 (R − TM, ER)
Неорганические материалы. 2020. Т.56. №2. С.200-207. DOI: 10.31857/S0002337X20020116 РИНЦ
Структурные преобразования порядок–беспорядок в высокодефектных флюоритпроизводных твердых растворах на основе R2TiO5 (R − TM, ER)
Неорганические материалы. 2020. Т.56. №2. С.200-207. DOI: 10.31857/S0002337X20020116 РИНЦ
Dates:
Submitted: | Jun 26, 2019 |
Accepted: | Sep 4, 2019 |
Published print: | Feb 1, 2020 |
Published online: | Mar 18, 2020 |
Identifiers:
Web of science | WOS:000520864200013 |
Scopus | 2-s2.0-85082111566 |
Elibrary | 43261340 |
Chemical Abstracts | 2020:521813 |
OpenAlex | W3011063501 |