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Title: Evolution of the Fe{sup 3+} Ion Local Environment During the Phase Transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}

Abstract

Evolution of the local environment of Fe{sup 3+} ions in deposited Fe{sub 2}O{sub 3}/SiO{sub 2} nanoparticles formed in samples with different iron contents was investigated in order to establish the conditions for obtaining the stable ε-Fe{sub 2}O{sub 3}/SiO{sub 2} 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-Fe{sub 2}O{sub 3} 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-Fe{sub 2}O{sub 3} 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 changesmore » of the Fe{sup 3+} ion local environment during the phase transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}.« less

Authors:
 [1]; ; ; ;  [2]; ; ;  [1];  [2]
  1. Boreskov Institute of Catalysis (Russian Federation)
  2. Federal Research Center KSC SB RAS, Kirensky Institute of Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22776952
Resource Type:
Journal Article
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Volume: 31; Journal Issue: 4; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2017 Springer Science+Business Media, LLC; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1557-1939
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCINATION; CONCENTRATION RATIO; DEPOSITION; HEMATITE; IMPURITIES; IRON; IRON IONS; IRON OXIDES; MAGNETIC PROPERTIES; MICROSTRUCTURE; MOESSBAUER SPECTROMETERS; NANOPARTICLES; PHASE TRANSFORMATIONS; SILICA GEL; SILICON OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Yakushkin, S. S., E-mail: stas-yk@catalysis.ru, Balaev, D. A., Dubrovskiy, A. A., Semenov, S. V., Shaikhutdinov, K. A., Kazakova, M. A., Bukhtiyarova, G. A., Martyanov, O. N., and Bayukov, O. A.. Evolution of the Fe{sup 3+} Ion Local Environment During the Phase Transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}. United States: N. p., 2018. Web. doi:10.1007/S10948-017-4307-Y.
Yakushkin, S. S., E-mail: stas-yk@catalysis.ru, 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 Fe{sup 3+} Ion Local Environment During the Phase Transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}. United States. doi:10.1007/S10948-017-4307-Y.
Yakushkin, S. S., E-mail: stas-yk@catalysis.ru, Balaev, D. A., Dubrovskiy, A. A., Semenov, S. V., Shaikhutdinov, K. A., Kazakova, M. A., Bukhtiyarova, G. A., Martyanov, O. N., and Bayukov, O. A.. Sun . "Evolution of the Fe{sup 3+} Ion Local Environment During the Phase Transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}". United States. doi:10.1007/S10948-017-4307-Y.
@article{osti_22776952,
title = {Evolution of the Fe{sup 3+} Ion Local Environment During the Phase Transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}},
author = {Yakushkin, S. S., E-mail: stas-yk@catalysis.ru and Balaev, D. A. and Dubrovskiy, A. A. and Semenov, S. V. and Shaikhutdinov, K. A. and Kazakova, M. A. and Bukhtiyarova, G. A. and Martyanov, O. N. and Bayukov, O. A.},
abstractNote = {Evolution of the local environment of Fe{sup 3+} ions in deposited Fe{sub 2}O{sub 3}/SiO{sub 2} nanoparticles formed in samples with different iron contents was investigated in order to establish the conditions for obtaining the stable ε-Fe{sub 2}O{sub 3}/SiO{sub 2} 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-Fe{sub 2}O{sub 3} 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-Fe{sub 2}O{sub 3} 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 Fe{sup 3+} ion local environment during the phase transition ε-Fe{sub 2}O{sub 3} → α-Fe{sub 2}O{sub 3}.},
doi = {10.1007/S10948-017-4307-Y},
journal = {Journal of Superconductivity and Novel Magnetism},
issn = {1557-1939},
number = 4,
volume = 31,
place = {United States},
year = {2018},
month = {4}
}