Effect of gadolinium on magnetic circular dichroism and electron magnetic resonance of ε-Fe2O3 nanoparticles formed in borate glasses
| Autor: | D. A. Velikanov, Vladimir I. Zaikovskii, Irina S. Edelman, O. S. Ivanova, R. D. Ivantsov, Eleonora Petrakovskaja, Yan V. Zubavichus, S. A. Stepanov, Janis Kliava |
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| Přispěvatelé: | Kirensky Institute of Physics, Russian Academy of Sciences [Moscow] (RAS), Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Siberian Federal University (SibFU), Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences (SB RAS), National Research Centre 'Kurchakov Institute' (NRC KI), S.I. Vavilov State Optical Institute |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnetism Gadolinium Analytical chemistry chemistry.chemical_element 02 engineering and technology 01 natural sciences Iron oxides law.invention chemistry.chemical_compound Magnetization law 0103 physical sciences Electron magnetic resonance Materials Chemistry Borate glasses Electron paramagnetic resonance 010302 applied physics Magnetic circular dichroism 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism chemistry Ceramics and Composites Magnetic nanoparticles Nanoparticles 0210 nano-technology Iron oxide nanoparticles Superparamagnetism |
| Zdroj: | Journal of Non-Crystalline Solids Journal of Non-Crystalline Solids, Elsevier, 2019, 506, pp.68-79. ⟨10.1016/j.jnoncrysol.2018.12.006⟩ |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2018.12.006⟩ |
| Popis: | International audience; A remarkable characteristic of borate glasses is the ability of forming magnetic nanoparticles at low doping with transition element oxides. We have studied structure and magnetic properties of iron oxide nanoparticles formed in borate glasses, in particular, concentration and temperature dependences of magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) spectra. A series of glasses of molar composition 22.5K 2 O-22.5Al 2 O 3-55B 2 O 3 doped with 1.5 mass % of Fe 2 O 3 and different contents of Gd 2 O 3 from 0.1 to 1.0 mass % was prepared using a conventional melt quenching technique and subjected to an additional thermal treatment. The whole set of results allows to identify the predominant magnetic phase in these glasses as ε-Fe 2 O 3 nanoparticles, with a considerable part of iron ions substituted by gadolinium. Analysis and computer simulations of the EMR spectra allow separating the contribution of electron paramagnetic resonance of diluted iron ions and together with the temperature dependences of magnetization demonstrate a superparamagnetic character of the nano-particle magnetism. |
| Databáze: | OpenAIRE |
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