The Formation of Structural Defects in the Ce-Sm-O and Ce-Sm-O/Ru Nanosystems Synthesized by the Sol-Gel Method Full article
Journal |
Russian Journal of Physical Chemistry A
ISSN: 0036-0244 , E-ISSN: 1531-863X |
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Output data | Year: 2005, Volume: 79, Number: 8, Pages: 1187-1191 Pages count : 5 | ||||||
Tags | Concentration (process); Crystal defects; Dehydration; Electron microscopy; Hydrolysis; Nanostructured materials; Paramagnetic resonance; Sol-gels; Structure (composition); Synthesis (chemical); X ray diffraction analysis | ||||||
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Abstract:
The structure of Ce-Sm-O and Ce-Sm-O/Ru samples with 5, 10, and 15 at % Sm synthesized by the inorganic sol-gel method was characterized by EPR, X-ray diffraction, and electron microscopy. The thermal dehydration of xerogels of the products of cohydrolysis of Ce(IV) and Sm(IH) at 600-800 degrees C results in the formation of a structure on the basis of cubic CeO2 with particle sizes less than 10 rim. The EPR spectra of Ce-Sm-O contain signals of the Ce3+ (g(perpendicular to) = 1.966 and g(parallel to) = 1.947) and [SmOn-V-O] (g(parallel to) = 1.996-1.998 and g(perpendicular to) = 1.973-1.974) centers with different coordination environment symmetries. The introduction of Sm(III) decreases the concentration of volume Ce3+ centers to a greater degree the higher the content of Sm(III). After deposition of Ru(IV), the concentration of Ce3+ increases substantially, by one to two orders of magnitude, and surface Ce3+ ions appear (g(perpendicular to) = 1.966 and g(parallel to) = 1.940). Synthesis through the step of sol formation ensures homogeneous distribution of 10% Sm in the crystal lattice of CeO2.
Cite:
Ivanovskaya M.I.
, Frolova E.V.
, Sadykov V.A.
, Neophytides S.
The Formation of Structural Defects in the Ce-Sm-O and Ce-Sm-O/Ru Nanosystems Synthesized by the Sol-Gel Method
Russian Journal of Physical Chemistry A. 2005. V.79. N8. P.1187-1191. WOS Scopus РИНЦ
The Formation of Structural Defects in the Ce-Sm-O and Ce-Sm-O/Ru Nanosystems Synthesized by the Sol-Gel Method
Russian Journal of Physical Chemistry A. 2005. V.79. N8. P.1187-1191. WOS Scopus РИНЦ
Original:
Ивановская М.И.
, Фролова Е.В.
, Садыков В.А.
, Неофитидес С.
Формирование структурных дефектов в наносистемах Ce-Sm-O и Ce-Sm-O/Ru, синтезированных золь-гель-методом
Журнал физической химии. 2005. Т.79. №8. С.1351-1356. RSCI РИНЦ
Формирование структурных дефектов в наносистемах Ce-Sm-O и Ce-Sm-O/Ru, синтезированных золь-гель-методом
Журнал физической химии. 2005. Т.79. №8. С.1351-1356. RSCI РИНЦ
Dates:
Submitted: | Jan 11, 2005 |
Published print: | Aug 1, 2005 |
Identifiers:
Web of science | WOS:000230855900001 |
Scopus | 2-s2.0-24644467853 |
Elibrary | 13497745 |
Chemical Abstracts | 2005:702367 |
Chemical Abstracts (print) | 144:278422 |