Field strength of network-modifying cation dictates the structure of (Na-Mg) aluminosilicate glasses
Sreenivasan, Harisankar; Kinnunen, Päivö; Adesanya, Elijah; Patanen, Minna; Kantola, Anu M.; Telkki, Ville-Veikko; Huttula, Marko; Cao, Wei; Provis, John L.; Illikainen, Mirja (2020-08-20)
Sreenivasan H, Kinnunen P, Adesanya E, Patanen M, Kantola AM, Telkki V-V, Huttula M, Cao W, Provis JL and Illikainen M (2020) Field Strength of Network-Modifying Cation Dictates the Structure of (Na-Mg) Aluminosilicate Glasses. Front. Mater. 7:267. doi: 10.3389/fmats.2020.00267
© 2020 Sreenivasan, Kinnunen, Adesanya, Patanen, Kantola, Telkki, Huttula, Cao, Provis and Illikainen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2020082563107
Tiivistelmä
Abstract
Aluminosilicate glasses are materials with a wide range of technological applications. The field strength of network-modifying cations strongly influences the structure of aluminosilicate glasses and their suitability for various applications. In this work, we study the influence of the field strength of network-modifying cations on the structure of [(Na₂O)1–x(MgO)ₓ(Al₂O₃)0·25(SiO₂)1·25] glasses. Due to the higher cation field strength of magnesium than sodium, magnesium prefers the role of network modifier, while sodium preferentially acts as a charge compensator. When magnesium replaces sodium as network modifier, Q³ silicon species are converted into Q² species. The replacement of sodium with magnesium as charge compensator leads to the following changes: (1) the proportion of aluminum-rich Q⁴ species [Q⁴(4Al) and Q⁴(3Al)] decreases, while the proportion of aluminum-deficient Q⁴ species [Q⁴(2Al) and Q⁴(1Al)] increases; and (2) there is an increased tendency for phase separation between silica-rich and alumina-rich glasses.
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