TY - JOUR
T1 - Characterisation of Ga2O3-Na2O-CaO-ZnO- SiO2 bioactive glasses
AU - Wren, A. W.
AU - Keenan, T.
AU - Coughlan, A.
AU - Laffir, F. R.
AU - Boyd, D.
AU - Towler, M. R.
AU - Hall, M. M.
PY - 2013/6
Y1 - 2013/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84880570630&partnerID=8YFLogxK
U2 - 10.1007/s10853-013-7211-2
DO - 10.1007/s10853-013-7211-2
M3 - Article
AN - SCOPUS:84880570630
SN - 0022-2461
VL - 48
SP - 3999
EP - 4007
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 11
ER -