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Journal of Advanced Ceramics 2012, 1(2): 138-143 https://doi.org/10.1007/s40145-012-0010-4
Research Article | Open Access | Issue | Published: 08 September 2012

Magnetic glass-ceramics

Show Author's Information Viorel SANDUa,*( ),  Mirela Sidonia NICOLESCUa,  Victor KUNCSERa,  Raluca DAMIANa,  Elena SANDUb
National Institute of Materials Physics, Magurele 077125, Romania
“Horia Hulubei” National Institute of Nuclear Physics and Engineering, Magurele 077125, Romania
Keywords:
Mössbauer spectroscopy, grain growth, glass ceramics, Fe3O4
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SANDU V, NICOLESCU MS, KUNCSER V, et al. Magnetic glass-ceramics. Journal of Advanced Ceramics, 2012, 1(2): 138-143. https://doi.org/10.1007/s40145-012-0010-4
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Abstract Full text About this article

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.


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About this article

Magnetic glass-ceramics

Show Author's information Viorel SANDUa,*( ), Mirela Sidonia NICOLESCUa, Victor KUNCSERa, Raluca DAMIANa, Elena SANDUb
National Institute of Materials Physics, Magurele 077125, Romania
“Horia Hulubei” National Institute of Nuclear Physics and Engineering, Magurele 077125, Romania

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.

Keywords: Mössbauer spectroscopy, grain growth, glass ceramics, Fe3O4

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Publication history

Received: 19 December 2011
Accepted: 10 March 2012
Published: 08 September 2012
Issue date: June 2012

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© The author(s) 2012

Acknowledgements

This work was supported by the Romanian NASC under the Project EURATOM.

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