TY - JOUR
T1 - Structure of MgO/CaO sodium aluminosilicate glasses
T2 - Raman spectroscopy study
AU - Bechgaard, Tobias K.
AU - Scannell, Garth
AU - Huang, Liping
AU - Youngman, Randall E.
AU - Mauro, John C.
AU - Smedskjaer, Morten M.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/8/15
Y1 - 2017/8/15
N2 - Understanding the composition dependence of the atomic structure of multicomponent aluminosilicate glasses is a challenging problem. Aluminum has a crucial influence on the structure-property relations in these systems, but there are still questions regarding its local structural environment. Here, we present results detailing the network structure of twenty quaternary MgO/CaO-Na2O-Al2O3-SiO2 glasses upon Al2O3-for-SiO2 and MgO-for-CaO substitutions using room temperature and in situ high-temperature Raman spectroscopy. The Raman spectra reveal that the Mg-containing glasses violate the Al-avoidance at lower Al2O3 concentration than the Ca-containing glasses. Furthermore, the alkaline earth ions acting as charge-compensators for tetrahedral aluminum are found to have a similar effect on the network structure (Qn speciation and Al/Si mixing), while they affect the network differently when they are in a modifying role. Increasing cation field strength allows for stabilization of networks with a larger distribution of bond angles.
AB - Understanding the composition dependence of the atomic structure of multicomponent aluminosilicate glasses is a challenging problem. Aluminum has a crucial influence on the structure-property relations in these systems, but there are still questions regarding its local structural environment. Here, we present results detailing the network structure of twenty quaternary MgO/CaO-Na2O-Al2O3-SiO2 glasses upon Al2O3-for-SiO2 and MgO-for-CaO substitutions using room temperature and in situ high-temperature Raman spectroscopy. The Raman spectra reveal that the Mg-containing glasses violate the Al-avoidance at lower Al2O3 concentration than the Ca-containing glasses. Furthermore, the alkaline earth ions acting as charge-compensators for tetrahedral aluminum are found to have a similar effect on the network structure (Qn speciation and Al/Si mixing), while they affect the network differently when they are in a modifying role. Increasing cation field strength allows for stabilization of networks with a larger distribution of bond angles.
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U2 - 10.1016/j.jnoncrysol.2017.05.014
DO - 10.1016/j.jnoncrysol.2017.05.014
M3 - Article
AN - SCOPUS:85019359581
SN - 0022-3093
VL - 470
SP - 145
EP - 151
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
ER -