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Magnetic properties of nanostructured SiOo2:Eu3+ powders

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2006
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Authors
Spasojević, Vojislav
Dramićanin, Miroslav
Jokanović, Vukoman
Andrić, Željka
Blanuša, Jovan
Kusigerski, Vladan
Mitrić, Miodrag
Tadić, Marin
Kapičić, Ana
Article (Published version)
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Abstract
Eu-doped silica nanoparticles with different concentrations of europium (3% 6%and 15at.%) were prepared by a hydrothermal procedure. Light scattering measurements of the silica colloids as well as TEM microscopy, revealed a narrow size distribution of the particles, ranging from 5 to 10 nm. X-Ray diffraction showed that all the powders were amorphous. Magnetic susceptibility vs. temperature measurements showed a behavior typical for Eu3+ ions, with a plateau below 60K, and an increase of the mass susceptibility with Eu concentration. The splitting of zero-field cooled (ZFC) and field-coled (FC) susceptibility branches increased with the europium concentration, indicating the presence of interparticle interactions. At temperatures below 40K, a contribution of paramagnetic impurities obeying the Curie law was observed. Heat treatment of the powders at 823K and 1073K increased the magnetic susceptibility. The appearance of a small peak at 70K indicated the presence of small quantities of ...ferromagnetic EuO in the powders after heating.

Keywords:
magnetic properties / nanoparticles / rare earths / silica / light scattering
Source:
Journal of the Serbian Chemical Society, 2006, 71, 4, 412-420
Publisher:
  • Belgrade : Serbian Chemical Society

DOI: 10.2298/JSC0604413S

ISSN: 0352-5139 (Print); 1820-7421 (Online)

WoS: 000238365500010

Scopus: 2-s2.0-33746447140
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URI
http://dais.sanu.ac.rs/123456789/280
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  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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