Influence of Synthesis Conditions on the Crystal Structure of the Powder Formed in the “HfO2- CeO2/Ce2O3” System Full article
Conference |
III Международная конференция «Лазерные, плазменные исследования и технологии" 24-27 Jan 2017 , Москва |
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Journal |
Journal of Physics: Conference Series
ISSN: 1742-6588 , E-ISSN: 1742-6596 |
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Output data | Year: 2017, Volume: 941, Article number : 012080, Pages count : 7 DOI: 10.1088/1742-6596/941/1/012080 | ||||||||
Tags | Atmospheric temperature; Cerium; Cerium oxide; Chemical analysis; Fluorspar; Hafnium oxides; Isothermal annealing; Oxidation; Reaction intermediates; Thermogravimetric analysis; X ray absorption; X ray absorption fine structure spectroscopy; X ray diffraction | ||||||||
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Abstract:
Influence of synthesis conditions (type of atmosphere: reduction or oxidation, annealing temperature) on the chemical composition and structure of the compounds formed in the "HfO2 - CeO2/Ce2O3" system has been investigated by X-ray absorption fine structure spectroscopy combined with Raman spectroscopy, X-ray diffraction and thermogravimetric analysis. It was revealed that isothermal annealing of precursor at temperatures less than 1000°C in air leads to formation of Ce0.5Hf0.5O2 powders with cubic fluorite-type structure (space group Fm-3m). Further increase of annealing temperatures above 1000°C causes decomposition of formed crystal structure into two phases: cubic and monoclinic. Annealing in reduction hydrogen atmosphere causes formation of Ce4+2xCe3+2-2xHf2O7+x compounds with intermediate oxidation state of cerium, where value of x depends on the reducing conditions and treatment parameters. Annealing in vacuum at 1400°C strongly reduces the content of Ce4+ in a powder samples and leads to formation of pyrochlore structure (space group Fd-3m) with predominant +3 oxidation state of cerium.
Cite:
Popov V.V.
, Menushenkov A.P.
, Khubbutdinov R.M.
, Yastrebtsev A.A.
, Svetogorov R.D.
, Zubavichus Y.V.
, Trigub A.L.
, Sharapov A.S.
, Pisarev A.A.
, Kurilkin V.V.
, Tsarenko N.A.
, Arzhatkina L.A.
Influence of Synthesis Conditions on the Crystal Structure of the Powder Formed in the “HfO2- CeO2/Ce2O3” System
Journal of Physics: Conference Series. 2017. V.941. 012080 :1-7. DOI: 10.1088/1742-6596/941/1/012080 WOS Scopus РИНЦ
Influence of Synthesis Conditions on the Crystal Structure of the Powder Formed in the “HfO2- CeO2/Ce2O3” System
Journal of Physics: Conference Series. 2017. V.941. 012080 :1-7. DOI: 10.1088/1742-6596/941/1/012080 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Published print: | Dec 1, 2017 |
Submitted: | Dec 14, 2017 |
Published online: | Jan 12, 2018 |
Identifiers:
Web of science | WOS:000431652800080 |
Scopus | 2-s2.0-85045012144 |
Elibrary | 35532305 |
Chemical Abstracts | 2018:2175072 |
OpenAlex | W4236622463 |