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Magnetisation effects of multicore magnetite nanoparticles crystallised from a silicate glass

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Abstract

Magnetic multicore nanoparticles were produced by crystallisation of a glass with the composition Na2O·Al2O3·B2O3·SiO2·Fe2O3. During cooling of the melt, in a first step, phase separation occurred and droplets enriched in boron and iron oxide were formed. These droplets crystallised spontaneously during cooling. The phase-separated droplets had sizes in the range from 200 to 800 nm. Inside the droplets, magnetite crystals with a mean size of 33 nm occurred. Magnetometer measurements showed the occurrence of a small hysteresis which indicates predominantly superparamagnetic behaviour of the magnetite crystals. The magnetic domains of the phase-separated droplets were studied by magnetic force microscopy. In this article, a glass which is exposed to a magnetic field shows droplet-shape phase separations where the single-domain magnetite crystals do not have a preferred orientation of the magnetic dipoles. By contrast, the whole droplet shows one magnetic dipole parallel to the external field if the glass is exposed to a magnetic field during measurement.

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Authors and Affiliations

  1. Otto-Schott-Institut, Jena University, Fraunhoferstrasse 6, 07743, Jena, Germany

    Christian Worsch & Christian Rüssel

  2. Ilmenau University of Technologie, Gustav-Kirchhoff-Strasse 5, 98684, Ilmenau, Germany

    Peter Schaaf

  3. University of Chemical Technology and Metallurgy, Kliment Ohridski Blvd. 8, 1756, Sofia, Bulgaria

    Ruzha Harizanova

Authors
  1. Christian Worsch
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  2. Peter Schaaf
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  3. Ruzha Harizanova
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  4. Christian Rüssel
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Correspondence to Christian Worsch.

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Worsch, C., Schaaf, P., Harizanova, R. et al. Magnetisation effects of multicore magnetite nanoparticles crystallised from a silicate glass. J Mater Sci 47, 5886–5890 (2012). https://doi.org/10.1007/s10853-012-6490-3

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  • DOI: https://doi.org/10.1007/s10853-012-6490-3

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