Magnetic Nanoparticles Formed in Glasses Co-Doped with Iron and Larger Radius Elements Научная публикация
Журнал |
Journal of Applied Physics
ISSN: 0021-8979 , E-ISSN: 1089-7550 |
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Вых. Данные | Год: 2012, Том: 112, Номер: 8, Номер статьи : 084331, Страниц : 20 DOI: 10.1063/1.4759244 | ||||||||||||
Ключевые слова | 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 | ||||||||||||
Авторы |
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Организации |
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Информация о финансировании (5)
1 | Российский фонд фундаментальных исследований | 07-02-92174 |
2 | European Commission | 255662 FP7-PEOPLE-2009-IIF EPREXINA |
3 | Министерство образования и науки Российской Федерации | 16.552.11.7003 |
4 | Совет по грантам Президента Российской Федерации | НШ-1044.2012.2 |
5 | Российский фонд фундаментальных исследований | 11-02-00972 (01201164211) |
Реферат:
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.
Библиографическая ссылка:
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
Файлы:
Полный текст от издателя
Даты:
Поступила в редакцию: | 2 апр. 2012 г. |
Принята к публикации: | 25 сент. 2012 г. |
Опубликована в печати: | 15 окт. 2012 г. |
Опубликована online: | 25 окт. 2012 г. |
Идентификаторы БД:
Web of science | WOS:000310597500131 |
Scopus | 2-s2.0-84868356779 |
РИНЦ | 20498584 |
Chemical Abstracts | 2012:1566032 |
Chemical Abstracts (print) | 157:724074 |
OpenAlex | W1993858482 |