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Specific Structural Features of LnZrOx (Ln: La, Sm) Mixed Oxides Prepared by Different Methods Full article

Journal Progress in Natural Science: Materials International
ISSN: 1002-0071 , E-ISSN: 1745-5391
Output data Year: 2018, Volume: 28, Number: 4, Pages: 437-446 Pages count : 10 DOI: 10.1016/j.pnsc.2018.07.007
Tags Fluorites; Pyrochlores; Synthesis; Powders; Structure
Authors Kuznetsova Tatyana 1 , Kriger Tamara 1,2 , Chesalov Yurii 1 , Boronin Andrey 1,2 , Ishchenko Arcadii 1,2 , Pandis Pavlos K. 3 , Krivensov Vladimir 1 , Litvak Galina 1 , Larina Tatyana 1 , Sadykov Vladislav 1,2 , Stathopoulos Vassilis N. 3
Affiliations
1 Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090 Novosibirsk, Russian Federation
2 Novosibirsk State University, 630090 Novosibirsk, Russian Federation
3 Laboratory of Chemistry and Materials Technology, Department of Electrical Engineering, School of Technological Applications, Technological Education Institute of Sterea Ellada, 34400 Psachna campus, Evia, Greece

Funding (3)

1 Federal Agency for Scientific Organizations 0303-2016-0013
2 European Commission 310750 FP7-NMP-2012-SMALL-6 THEBARCODE
3 The Ministry of Education and Science of the Russian Federation

Abstract: LnZrOx (Ln: La, Sm) mixed oxides of Ln: Zr = 1 were prepared by different methods (complex polymerized method, sorption of cations on starch from aqueous salt solution and conventional co-precipitation with additional redispersion of precipitate by ultra sound) and calcined at 700–1300 °C. Their specific structural features and changes were studied and discussed. Various characterization methods were used such as X-ray diffraction, Electron microscopy, Fourier-transform infrared and Raman spectroscopy, UV–Vis spectroscopy, X-Ray absorption fine structure and X-ray photoelectron spectroscopy. The formation of pyrochlore structure occurred at 1100–1300 °C from fluorite-like pseudocubic phase ZrO2 regardless the method of preparation. This phase had a block-like structure consisting of ZrO2 nanocrystals stabilized by Ln cations and residual anions such as hydroxyls and carbonates. The desorption of such anions with heating already started at 900 °C and lead to local changes of Zr cations coordination to octahedral and to the formation of pyrochlore nanodomains inclusions within fluorite-like phase. The increased cation mobility and further elimination of anions caused by further heating was accompanied by the formation of bulk pyrochlore phase at 1100–1300 °C. Even after calcination at 1300 °C the local microheterogeneity as well as defects were identified at domains boundaries or sintered microstructure. These specific features of the formed pyrochlores depend on the method of preparation.
Cite: Kuznetsova T. , Kriger T. , Chesalov Y. , Boronin A. , Ishchenko A. , Pandis P.K. , Krivensov V. , Litvak G. , Larina T. , Sadykov V. , Stathopoulos V.N.
Specific Structural Features of LnZrOx (Ln: La, Sm) Mixed Oxides Prepared by Different Methods
Progress in Natural Science: Materials International. 2018. V.28. N4. P.437-446. DOI: 10.1016/j.pnsc.2018.07.007 WOS Scopus РИНЦ AN OpenAlex
Files: Full text from publisher
Dates:
Submitted: Feb 12, 2018
Accepted: Jul 27, 2018
Published print: Aug 1, 2018
Published online: Aug 6, 2018
Identifiers:
Web of science: WOS:000443981100006
Scopus: 2-s2.0-85050966763
Elibrary: 35763049
Chemical Abstracts: 2018:1451434
OpenAlex: W2886112662
Citing:
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Web of science 3
Scopus 4
Elibrary 3
OpenAlex 4
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