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Radiation-Induced Nanostructures in an Iron Phosphate Glass

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Abstract

Electron and ion irradiation-induced nanostructures in an iron phosphate glass with a composition of 45 mol%Fe2O3-55 mol%P2Os have been characterized by advanced electron microbeam techniques. Analysis by energy-filtered transmission electron microscopy indicated that Fe-rich and P-rich nanophases were formed when the glass was irradiated under a broad (with a diameter of 1.2μm) electron beam [give the dose range]. Phase separation developed with the increase in electron dose (from 1.0×1026 e/m2 to 4.8×1026 e/m2) as a result of the formation of an Fe-rich phase and pure P-phase. The formation of the Fe-rich and the P-phases are thought to be due to mainly ionization process. Under a low energy ion beam irradiation, Fe/FeO nanoparticles were formed, as confirmed by selected-area electron diffraction analysis. However, no nanoparticles were observed under a high-energy high-dose ion irradiation. The ion beam-irradiation results suggest that the formation of the Fe/FeO nanoparticles was due to preferential sputtering during ion irradiation and that the nanoparticles lie within the surface layers of the glass.

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Acknowledgments

This work has been supported by the Environmental Management Science Program of the US DOE under the Grant DE-FG07-01ER63152. The JEOL-2010F STEM/TEM used in the present study was funded by NSF through the Grant DMR-9871177 and is operated by the Electron Microbeam Analysis Laboratory at University of Michigan. Prof. D. E. Day of the University of Missouri, Rolla very kindly provided the iron phosphate glass sample.

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Authors and Affiliations

  1. Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, 48109, USA

    K. Sun, T. Ding, L. M. Wang & R. C. Ewing

  2. Electron Microbeam Analysis Laboratory, University of Michigan, Ann Arbor, MI, 48109, USA

    K. Sun

  3. Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    L. M. Wang & R. C. Ewing

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  1. K. Sun
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  2. T. Ding
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  3. L. M. Wang
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  4. R. C. Ewing
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Sun, K., Ding, T., Wang, L.M. et al. Radiation-Induced Nanostructures in an Iron Phosphate Glass. MRS Online Proceedings Library 792, 303–308 (2003). https://doi.org/10.1557/PROC-792-R3.21

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  • DOI: https://doi.org/10.1557/PROC-792-R3.21

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