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Nano particles of iron oxides in SiO2 glass prepared by ion implantation

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Abstract

Quartz (SiO2) glass was implanted with 5 × 1016 57Fe ions/cm2 at a substrate temperature of 500 °C, and annealed at temperatures between 700 and 950 °C. The implanted and annealed plates were characterized by conversion electron Mössbauer spectroscopy (CEMS), and measured by a Kerr effect magnetometer or a vibration sample magnetometer. Kerr effect measurement of as-implanted SiO2 glass showed ferromagnetism at room temperature. CEM spectrum of the as-implanted glass consisted of magnetic relaxation peaks of finely dispersed metallic Fe species, and paramagnetic doublets of Fe3+ and Fe2+ species. The sample heated at 700 °C contained large grains of metallic Fe and a lot of oxidation products of Fe2+ species. After oxidation at temperatures higher than 800 °C, the samples showed also ferromagnetism, which was attributed mainly to ferromagnetic ε-Fe2O3 precipitated in SiO2 matrix. Small amounts of α-Fe2O3 were produced at 950 °C. The results suggest that ion implantation and oxidation make a transparent ferromagnetic glass possible.

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Acknowledgements

Authors thank Mr. S. Iio for help of measurement of Mössbauer spectra and Dr. Y. Hirose for help of measurement of Kerr effect, respectively.

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Authors and Affiliations

  1. School of Engineering, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    K. Nomura

  2. Forschungszentrum Dresden-Rossendorf e. V, Postfach 510119, 01324, Dresden, Germany

    H. Reuther

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  1. K. Nomura
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  2. H. Reuther
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Correspondence to K. Nomura.

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Nomura, K., Reuther, H. Nano particles of iron oxides in SiO2 glass prepared by ion implantation. J Radioanal Nucl Chem 287, 341–346 (2011). https://doi.org/10.1007/s10967-010-0858-0

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  • DOI: https://doi.org/10.1007/s10967-010-0858-0

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