Evolution of the Fe3+ Ion Local Environment During the Phase Transition ε-Fe2O3 → α-Fe2O3 | Sciact - CRIS-система Института катализа

Evolution of the Fe3+ Ion Local Environment During the Phase Transition ε-Fe2O3 → α-Fe2O3 Научная публикация

Журнал

Journal of Superconductivity and Novel Magnetism
ISSN: 1557-1939 , E-ISSN: 1557-1947

Вых. Данные

Год: 2018, Том: 31, Номер: 4, Страницы: 1209-1217 Страниц : 9 DOI: 10.1007/s10948-017-4307-y

Ключевые слова

Magnetic properties, Mossbauer spectroscopy, Phase transition, Structure size effect, ε−Fe2O3 iron oxide nanoparticles

Авторы

Yakushkin S.S. ^1,2,3 , Balaev D.A. ³ , Dubrovskiy A.A. ³ , Semenov S.V. ³ , Shaikhutdinov K.A. ³ , Kazakova M.A. ^1,2 , Bukhtiyarova G.A. ^1,3 , Martyanov O.N. ^1,2,3 , Bayukov O.A. ³

Организации

1	Boreskov Institute of Catalysis, Novosibirsk, Lavrentieva 5, 630090 Russia
2	Novosibirsk State University, Novosibirsk, 630090 Russia
3	Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia

Информация о финансировании (1)

Российский научный фонд

17-12-01111

Evolution of the local environment of Fe3+ ions in deposited Fe2O3/SiO2 nanoparticles formed in samples with different iron contents was investigated in order to establish the conditions for obtaining the stable ε-Fe2O3/SiO2 samples without impurities of other iron oxide polymorphs. Microstructure of the samples with an iron content of up to 16% is studied by high-resolution transmission electron microscopy, X-ray diffraction analysis, and Mössbauer spectroscopy, and their magnetic properties are examined. At iron concentrations below 6%, calcinations of iron-containing precursor nanoparticles in a silica gel matrix lead to the formation of the ε-Fe2O3 iron oxide polymorphic modification without foreign phase impurities, while at the iron concentration in the range of 6–12%, the hematite phase forms in the sample in the fraction of no more than 5%. It is concluded on the basis of the data obtained that the spatial stabilization of iron-containing particles is one of the main factors facilitating the formation of the ε-Fe2O3 phase in a silica gel matrix without other iron oxide polymorphs. It is demonstrated that the increase in the iron content leads to the formation of larger particles in the sample and gradual changes of the Fe3+ ion local environment during the phase transition ε-Fe2O3 → α-Fe2O3.

Yakushkin S.S. , Balaev D.A. , Dubrovskiy A.A. , Semenov S.V. , Shaikhutdinov K.A. , Kazakova M.A. , Bukhtiyarova G.A. , Martyanov O.N. , Bayukov O.A.
Evolution of the Fe3+ Ion Local Environment During the Phase Transition ε-Fe2O3 → α-Fe2O3
Journal of Superconductivity and Novel Magnetism. 2018. V.31. N4. P.1209-1217. DOI: 10.1007/s10948-017-4307-y WOS Scopus РИНЦ CAPlus OpenAlex

Поступила в редакцию:	10 авг. 2017 г.
Принята к публикации:	19 авг. 2017 г.
Опубликована online:	31 авг. 2017 г.
Опубликована в печати:	1 апр. 2018 г.

Web of science:	WOS:000427294500035
Scopus:	2-s2.0-85028618531
РИНЦ:	41771576
Chemical Abstracts:	2017:1413085
OpenAlex:	W2750881438

БД	Цитирований
Web of science	11
Scopus	11
РИНЦ	13
OpenAlex	13