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Journal of Advanced Ceramics

, Volume 1, Issue 2, pp 138–143 | Cite as

Magnetic glass-ceramics

  • Viorel Sandu
  • Mirela Sidonia Nicolescu
  • Victor Kuncser
  • Raluca Damian
  • Elena Sandu
Open Access
Research Article

Abstract

We present the magnetic properties of magnetic glass ceramics obtained by crystallization of Fe containing borosilicate glass. Two types of nucleators have been used: Cr2O3 and P2O5. The role of the nucleators proved to be crucial in the size and morphology of the crystallites developed within glassy matrix as well in the magnetic response. The former stimulates the growth of regular single crystals uniformly dispersed within the matrix whereas the latter leads to the formation of grains made of tiny (30 nm), nanocrystals. The magnetic response depends on the amount of Fe ions left dispersed within glassy matrix as paramagnetic ions. Although P2O5 leads to the best structural magnetite, almost 42% of Fe ions are left dispersed in the matrix without magnetic interaction. In the case of Cr2O3, the paramagnetic Fe is decreased to 12% but structural deficiency in the occupancy of the Fe sites of magnetite is revealed by Mössbauer spectroscopy.

Key words

glass ceramics Fe3O4 Mössbauer spectroscopy grain growth 

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Copyright information

© The Author(s) 2012

This article is published under license to BioMed Central Ltd. Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Viorel Sandu
    • 1
  • Mirela Sidonia Nicolescu
    • 1
  • Victor Kuncser
    • 1
  • Raluca Damian
    • 1
  • Elena Sandu
    • 2
  1. 1.National Institute of Materials PhysicsMagureleRomania
  2. 2.“Horia Hulubei” National Institute of Nuclear Physics and EngineeringMagureleRomania

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