Control over Crystal, Local Atomic and Electronic Structures of Cerium Chromates/Chromites via the Synthesis Conditions | Sciact - CRIS-система Института катализа

Control over Crystal, Local Atomic and Electronic Structures of Cerium Chromates/Chromites via the Synthesis Conditions Научная публикация

Журнал

Materials Chemistry and Physics
ISSN: 0254-0584 , E-ISSN: 1879-3312

Вых. Данные

Год: 2023, Том: 296, Номер статьи : 127269, Страниц : 13 DOI: 10.1016/j.matchemphys.2022.127269

Ключевые слова

Cerium chromates/chromites; Crystal and local structures; Synchrotron XRD; X-ray absorption fine structure (XAFS); Raman spectroscopy; FT-IR spectroscopy

Авторы

Popov V.V. ^1,2 , Menushenkov A.P. ¹ , Zubavichus Yan V. ³ , Dubyago F.E. ¹ , Yastrebtsev A.A. ¹ , Ivanov A.A. ¹ , Rudakov S.G. ¹ , Svetogorov R.D. ² , Khramov Evgeny V. ² , Kolyshkin N.A. ² , Tsarenko N.A. ⁴ , Shchetinin I.V. ⁵ , Bordyuzhin I.G. ⁵

Организации

1	National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409, Russia
2	National Research Center Kurchatov Institute, Moscow, 123182, Russia
3	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Koltsovo, 630559, Russia
4	JSC Design & Survey and Research & Development Institute of Industrial Technology, Moscow, 115409, Russia
5	National University of Science and Technology MISiS, Moscow, 119049, Russia

The influence exerted by specific synthesis protocol conditions on the crystal, local atomic and electronic structures of various types of Ce chromates/chromites prepared by the coprecipitation is studied using synchrotron X-ray diffraction, X-ray absorption fine structure (XAFS), Raman and Fourier transform infrared (FT-IR) spectroscopies, and simultaneous thermal analysis. Cerium chromate heptahydrate [Ce(CrO)(HO)]2HO with the monoclinic structure (sp. gr. P2/c) has been synthesized and characterized structurally for the first time. It has been established that calcination of all types of precursors in air at a temperature >450 leads to the formation of a mixture of CeO and Cr2O3 phases. The calcination in vacuum at 1200 affords CeCrO (with the orthorhombic structure, sp. gr. Pnma(62)), which upon repeated heating to above 650–700 in air tends to decompose into CeO and Cr2O3 phases. Long-range XRD data correlate well with the results of techniques sensitive to the local structure parameters, such as XAFS, Raman and FT-IR. XANES spectra measured at the Cr K- and Ce - edges strongly imply that the synthesis procedures are accompanied by concerted redox transformations s Cr6+ → Cr3+ and Ce3+ ⟷ Ce4+

Popov V.V. , Menushenkov A.P. , Zubavichus Y.V. , Dubyago F.E. , Yastrebtsev A.A. , Ivanov A.A. , Rudakov S.G. , Svetogorov R.D. , Khramov E.V. , Kolyshkin N.A. , Tsarenko N.A. , Shchetinin I.V. , Bordyuzhin I.G.
Control over Crystal, Local Atomic and Electronic Structures of Cerium Chromates/Chromites via the Synthesis Conditions
Materials Chemistry and Physics. 2023. V.296. 127269 :1-13. DOI: 10.1016/j.matchemphys.2022.127269 WOS Scopus РИНЦ CAPlusCA OpenAlex СКИФ ID

Поступила в редакцию:	28 сент. 2022 г.
Опубликована online:	22 дек. 2022 г.
Опубликована в печати:	15 февр. 2023 г.
Принята к публикации:	24 дек. 2023 г.

Web of science:	WOS:000938054100001
Scopus:	2-s2.0-85145254626
РИНЦ:	60265662
Chemical Abstracts:	2023:16822
Chemical Abstracts (print):	181:427617
OpenAlex:	W4313398456
СКИФ ID:	578

БД	Цитирований
OpenAlex	3
Web of science	3
Scopus	3