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Optical and structural investigations on iron-containing phosphate glasses

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Abstract

The article reports the preparation and complex characterization of iron-containing phosphate glasses considered to be ecological materials, as they contain non-toxic compounds related to environment. The oxide system Li2O–MgO–(CaO)–Al2O3–P2O5–(FeO/Fe2O3) was investigated in respect to its structural changes caused by MgO replacement with CaO and by the iron addition. UV–vis–NIR (ultraviolet–visible–near infrared) spectroscopy as well as thermo-gravimetric (TG) measurements, differential thermo-analysis (DTA), X-ray diffraction (XRD) analysis, electronic paramagnetic resonance (EPR), and Mossbauer (nuclear gamma resonance) spectroscopy have been used to investigate redox states and coordination symmetry of iron, together with vitreous network changes during the heat treatment up to 1000 °C. UV–vis–NIR transmission spectroscopy revealed no structural modifications when MgO was substituted by CaO, but noteworthy absorption bands attributed to Fe2+/Fe3+ species. TG analysis made in the 20–1000 °C range shows low weight loss accompanied by several thermal effects, as evidenced by DTA. XRD patterns for the glass samples heat treated at about 700 °C revealed the presence of different phosphate crystalline phases containing Mg, Al, and Fe ions. EPR spectroscopy revealed the presence of paramagnetic Fe3+ ions and the change of the first coordination symmetry, when the samples are heated below the vitreous transition temperature. Mossbauer spectroscopy has evidenced two paramagnetic species, Fe2+ and Fe3+, both in octahedral coordination symmetry and a clustering process supported by only Fe3+ ions.

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Acknowledgements

The authors are grateful to the Romanian Executive Agency for Higher Education and Research Funding, for the financial support in the frame of RP-8/2007 project-PN II Human Resources and PN 09-27.02.02/27.02.2009 (Nucleus Programme 2009–2011). The authors of the article are also grateful to Dr. Marin Cernea from the National Institute of Physics of Materials, Magurele, Romania for XRD measurements and invaluable discussions and suggestions on the crystalline phase formation within phosphate glass network.

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Authors and Affiliations

  1. Optospintronics Laboratory, National Institute of Research and Development for Optoelectronics—INOE 2000, 409 Atomistilor Str, P.O. MG-5, 77125, Magurele, Romania

    M. Elisa & R. Iordanescu

  2. Optical Glass Laboratory, National Institute of Glass, Bucharest, Romania

    B. A. Sava

  3. Magnetism and Superconductivity Department, National Institute of Materials Physics, Magurele, Romania

    G. Aldica, V. Kuncser, C. Valsangiacom & G. Schinteie

  4. Polymer Science Group, Faculty of Physics, University of Bucharest, Magurele, Romania

    F. Nastase & C. Nastase

  5. Department of Atomic and Nuclear Physics, Faculty of Physics, University of Bucharest, Magurele, Romania

    V. Bercu

  6. Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, P.O.Box 12-134, Bucharest, Romania

    A. Volceanov

  7. Department of Colloids, Institute of Physical Chemistry I.Murgulescu, Bucharest, Romania

    S. Peretz

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  1. M. Elisa
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  2. R. Iordanescu
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  3. B. A. Sava
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  4. G. Aldica
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  7. G. Schinteie
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  8. F. Nastase
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  9. C. Nastase
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  10. V. Bercu
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  11. A. Volceanov
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  12. S. Peretz
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Correspondence to M. Elisa.

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Elisa, M., Iordanescu, R., Sava, B.A. et al. Optical and structural investigations on iron-containing phosphate glasses. J Mater Sci 46, 1563–1570 (2011). https://doi.org/10.1007/s10853-010-4963-9

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  • DOI: https://doi.org/10.1007/s10853-010-4963-9

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