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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Edelman I. S., Ivanova O. S., Zubavichus Y., Trofimova N. N., Zaikovskiy V. I., Artemenko A., Curely J., Kliava J.
Заглавие : Magnetic nanoparticles in borate glasses: Identification and sizing
Коллективы : Russian Foundation for Basic Research, Russian Foundation for Basic Research, International Conference on Optimization of Electrical and Electronic Equipmen (22 May - 24 May 2014; Bran, Romania)
Место публикации : International Conference on Optimization of Electrical and Electronic Equipment (OPTIM 2014): IEEE Computer Society, 2014. - P.95-104. - ISBN 978-1-4799-5183-3, DOI 10.1109/OPTIM.2014.6850939
Примечания : Cited References: 60
Предметные рубрики: Engineering, Electrical and Electronic
Ключевые слова (''Своб.индексиров.''): superparamagnetic resonance--ferromagnetic-resonance--ferrite nanoparticles--oxide nanoparticles--faraday-rotation--ceramics--iron--crystallization--anisotropy--particles
Аннотация: Heat treatment of borate glasses co-doped with low contents of iron and larger radius elements: Dy, Tb, Gd, Ho, Er, Y and Bi results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: XRD, EXAFS, XANES and SAXS, show a broad distribution of nanoparticle sizes with characteristic 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 assigning the nanoparticle structure to maghemite. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. Variable-temperature electron magnetic resonance (EMR) studies confirm the formation of magnetic nanoparticles and the identification of their nature. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by 'direct' techniques. © 2014 IEEE.
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