Magnetic Nanoparticles Formed in Glasses Co-Doped with Iron and Larger Radius Elements Full article
Journal |
Journal of Applied Physics
ISSN: 0021-8979 , E-ISSN: 1089-7550 |
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Output data | Year: 2012, Volume: 112, Number: 8, Article number : 084331, Pages count : 20 DOI: 10.1063/1.4759244 | ||||||||||||
Tags | Computer simulation; Doping (additives); Electron transitions; Erbium; Extended X ray absorption fine structure spectroscopy; Gadolinium; Glass; Heat treatment; Holmium; Ions; Iron; Iron ores; Magnetic resonance; Magnetite nanoparticles; Magnetization; Nanoparticles; Superparamagnetism; Transmission electron microscopy; X ray diffraction | ||||||||||||
Authors |
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Affiliations |
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Funding (5)
1 | Russian Foundation for Basic Research | 07-02-92174 |
2 | European Commission | 255662 FP7-PEOPLE-2009-IIF EPREXINA |
3 | The Ministry of Education and Science of the Russian Federation | 16.552.11.7003 |
4 | Council for Grants of the President of the Russian Federation | НШ-1044.2012.2 |
5 | Russian Foundation for Basic Research | 11-02-00972 (01201164211) |
Abstract:
A new type of nanoparticle-containingglasses based on borate glasses co-doped with low contents of iron and larger radius elements, Dy, Tb, Gd, Ho, Er, Y, and Bi, is studied. Heat treatment of these glasses results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: x-ray diffraction, extended x-rayabsorption fine structure, x-rayabsorption near-edge structure, and small-angle x-ray scattering, show a broad distribution of nanoparticle sizes with characteristics depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism(MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite, and iron garnet allow to unambiguously assign the nanoparticle structure to maghemite, independently of co-dopant nature and of heat treatment regime used. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ions gathered in the nanoparticles. The static magnetization in heat treated samples has non-linear dependence on the magnetizing field with hysteresis. Zero-field cooled magnetization curves show that at higher temperatures the nanoparticles occur in superparamagnetic state with blocking temperatures above 100 K. Below ca. 20 K, a considerable contribution to both zero field-cooled and field-cooled magnetizations occurs from diluted paramagneticions. Variable-temperature electron magnetic resonance (EMR) studies unambiguously show that in as-prepared glassesparamagneticions are in diluted state and confirm the formation of magnetic nanoparticles already at earlier stages of heat treatment. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by “direct” techniques as well as superparamagnetic nanoparticle behaviour demonstrated in the magnetization studies.
Cite:
Edelman I.
, Ivanova O.
, Ivantsov R.
, Velikanov D.
, Zabluda V.
, Zubavichus Y.
, Veligzhanin A.
, Zaikovskiy V.
, Stepanov S.
, Artemenko A.
, Curely J.
, Kliava J.
Magnetic Nanoparticles Formed in Glasses Co-Doped with Iron and Larger Radius Elements
Journal of Applied Physics. 2012. V.112. N8. 084331 :1-20. DOI: 10.1063/1.4759244 WOS Scopus РИНЦ
Magnetic Nanoparticles Formed in Glasses Co-Doped with Iron and Larger Radius Elements
Journal of Applied Physics. 2012. V.112. N8. 084331 :1-20. DOI: 10.1063/1.4759244 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Apr 2, 2012 |
Accepted: | Sep 25, 2012 |
Published print: | Oct 15, 2012 |
Published online: | Oct 25, 2012 |
Identifiers:
Web of science | WOS:000310597500131 |
Scopus | 2-s2.0-84868356779 |
Elibrary | 20498584 |
Chemical Abstracts | 2012:1566032 |
Chemical Abstracts (print) | 157:724074 |
OpenAlex | W1993858482 |