Specific Structural Features of LnZrOx (Ln: La, Sm) Mixed Oxides Prepared by Different Methods | Sciact - CRIS-система Института катализа

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

Журнал

Progress in Natural Science: Materials International
ISSN: 1002-0071 , E-ISSN: 1745-5391

Вых. Данные

Год: 2018, Том: 28, Номер: 4, Страницы: 437-446 Страниц : 10 DOI: 10.1016/j.pnsc.2018.07.007

Ключевые слова

Fluorites; Pyrochlores; Synthesis; Powders; Structure

Авторы

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

Организации

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

Информация о финансировании (3)

1	Федеральное агентство научных организаций России	0303-2016-0013
2	European Commission	310750 FP7-NMP-2012-SMALL-6 THEBARCODE
3	Министерство образования и науки Российской Федерации

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.

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 CAPlus OpenAlex

Полный текст от издателя

Поступила в редакцию:	12 февр. 2018 г.
Принята к публикации:	27 июл. 2018 г.
Опубликована в печати:	1 авг. 2018 г.
Опубликована online:	6 авг. 2018 г.

Web of science:	WOS:000443981100006
Scopus:	2-s2.0-85050966763
РИНЦ:	35763049
Chemical Abstracts:	2018:1451434
OpenAlex:	W2886112662

БД	Цитирований
Web of science	3
Scopus	4
РИНЦ	3
OpenAlex	4