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Magnetic nanocrystals embedded in silicate glasses studied by polarized SANS

Raghuwanshi, V. S.; Harizanova, R.; Haas, Sylvio LU ; Tatchev, D.; Gugov, I.; Dewhurst, C.; Ruessel, C. and Hoell, A. (2014) In Journal of Non-Crystalline Solids 385. p.24-29
Abstract
Fe-Mn-O magnetic nanocrystals precipitate in a glass system SiO2/Na2O/Fe2O3/MnO during thermal annealing for different periods of time. We report here small angle neutron scattering investigations using polarized neutrons (pSANS) on these glass samples. Analysis of scattering data reveals the formation of spherical core-shell particles. The core of the particle is found to be magnetic and it is surrounded by a non-magnetic shell-like region. The size parameters of the nanocrystals calculated by pSANS data analyses are comparable with the small angle X-ray scattering (SAXS) investigations, previously reported. Contrary to other glasses in the studied system the diffusion of Fe and Mn ions is not impaired by a rigid shell. This is explained... (More)
Fe-Mn-O magnetic nanocrystals precipitate in a glass system SiO2/Na2O/Fe2O3/MnO during thermal annealing for different periods of time. We report here small angle neutron scattering investigations using polarized neutrons (pSANS) on these glass samples. Analysis of scattering data reveals the formation of spherical core-shell particles. The core of the particle is found to be magnetic and it is surrounded by a non-magnetic shell-like region. The size parameters of the nanocrystals calculated by pSANS data analyses are comparable with the small angle X-ray scattering (SAXS) investigations, previously reported. Contrary to other glasses in the studied system the diffusion of Fe and Mn ions is not impaired by a rigid shell. This is explained by decreasing of the glass transition temperature of the shell region while its composition departs from that of the matrix. (C) 2013 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Magnetic nanoparticles, Spherical core-shell, Glass, Polarized small, angle neutron scattering (pSANS)
in
Journal of Non-Crystalline Solids
volume
385
pages
24 - 29
publisher
Elsevier
external identifiers
  • wos:000331662500004
  • scopus:84888082698
ISSN
0022-3093
DOI
10.1016/j.jnoncrysol.2013.10.007
language
English
LU publication?
yes
id
12f4e332-737e-4527-b6bf-7499c1b90f61 (old id 4364185)
date added to LUP
2014-04-16 16:12:19
date last changed
2017-10-01 04:12:33
@article{12f4e332-737e-4527-b6bf-7499c1b90f61,
  abstract     = {Fe-Mn-O magnetic nanocrystals precipitate in a glass system SiO2/Na2O/Fe2O3/MnO during thermal annealing for different periods of time. We report here small angle neutron scattering investigations using polarized neutrons (pSANS) on these glass samples. Analysis of scattering data reveals the formation of spherical core-shell particles. The core of the particle is found to be magnetic and it is surrounded by a non-magnetic shell-like region. The size parameters of the nanocrystals calculated by pSANS data analyses are comparable with the small angle X-ray scattering (SAXS) investigations, previously reported. Contrary to other glasses in the studied system the diffusion of Fe and Mn ions is not impaired by a rigid shell. This is explained by decreasing of the glass transition temperature of the shell region while its composition departs from that of the matrix. (C) 2013 Elsevier B.V. All rights reserved.},
  author       = {Raghuwanshi, V. S. and Harizanova, R. and Haas, Sylvio and Tatchev, D. and Gugov, I. and Dewhurst, C. and Ruessel, C. and Hoell, A.},
  issn         = {0022-3093},
  keyword      = {Magnetic nanoparticles,Spherical core-shell,Glass,Polarized small,angle neutron scattering (pSANS)},
  language     = {eng},
  pages        = {24--29},
  publisher    = {Elsevier},
  series       = {Journal of Non-Crystalline Solids},
  title        = {Magnetic nanocrystals embedded in silicate glasses studied by polarized SANS},
  url          = {http://dx.doi.org/10.1016/j.jnoncrysol.2013.10.007},
  volume       = {385},
  year         = {2014},
}