Characterisation of Ga2O3-Na2O-CaO-ZnO- SiO2 bioactive glasses

A. W. Wren, T. Keenan, A. Coughlan, F. R. Laffir, D. Boyd, M. R. Towler, M. M. Hall

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The structural role of Gallium (Ga) is investigated when substituted for Zinc (Zn) in a 0.42SiO2-0.40-xZnO-0.10Na2O-0.08CaO glass series, (where x = 0.08). Each starting material was amorphous, and the network connectivity (NC) was calculated assuming Ga acts as both a network modifier (1.23), and also as a network former. Assuming a network forming role for Ga the NC increased with increasing Ga concentration throughout the glass series (Control 1.23, TGa-1 2.32 and TGa-2 3.00). X-ray photoelectron spectroscopy confirmed both composition and correlated NC predictions. Raman spectroscopy was employed to investigate Q-structure and found that a shift in wavenumbers occurred as the Ga concentration increased through the glass series, from 933, 951 to 960 cm-1. Magic angle spinning nuclear magnetic resonance determined a chemical shift from -73, -75 to -77 ppm as the Ga concentration increased, supporting Raman data. These results suggest that Ga acts predominantly as a network former in this particular Zn-silicate system.

    Original languageEnglish
    Pages (from-to)3999-4007
    Number of pages9
    JournalJournal of Materials Science
    Volume48
    Issue number11
    DOIs
    Publication statusPublished - Jun 2013

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