Structural dependence of chemical durability in modified aluminoborate glasses

Nerea Mascaraque Alvarez, Kacper Januchta, Anne Kristine F. Frederiksen, Randall E. Youngman, Mathieu Bauchy, Morten Mattrup Smedskjær

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)

Abstrakt

Alkali and alkaline earth aluminoborate glasses feature high resistance to cracking under sharp contact loading compared to other oxide glasses. However, due to the high content of hygroscopic B 2O 3, it is expected that applications of these glasses could be hindered by poor chemical durability in aqueous solutions. Indeed, the compositional and structural dependence of their dissolution kinetics remains unexplored. In this work, we correlate the dissolution rates of aluminoborate glasses in acidic, neutral, and basic solutions with the structural changes induced by varying the aluminum-to-boron ratio. In detail, we investigate a total of seventeen magnesium, lithium, and sodium aluminoborate glasses with fixed modifier content of 25 mol%. We show that the structural changes induced by alumina depend on the network modifier. We also demonstrate a correlation between the chemical durability at various pH values and the structural changes in Mg-, Li- and Na-aluminoborate glasses. The substitution of alumina by boron oxide leads to a general decrease in chemical corrosion in neutral and acidic solutions. The lowest dissolution rate value is observed in Mg-aluminoborate glasses, as a consequence of the intermediate character of magnesium which can increase the network cross-linking. For basic solutions, the chemical durability is almost constant for the different amount of alumina in the three series, likely because B 2O 3 is susceptible to nucleophilic attack, which is favored in high-OH solutions.

OriginalsprogEngelsk
TidsskriftJournal of the American Ceramic Society
Vol/bind102
Udgave nummer3
Sider (fra-til)1157-1168
Antal sider12
ISSN0002-7820
DOI
StatusUdgivet - 1 mar. 2019

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  • Projekter

    Atomistic Design of Chemically Durable Glasses

    Smedskjær, M. M. & Mascaraque, N.

    Villum Fonden

    01/12/201530/11/2017

    Projekter: ProjektForskning

    Citationsformater

    Mascaraque Alvarez, N., Januchta, K., Frederiksen, A. K. F., Youngman, R. E., Bauchy, M., & Smedskjær, M. M. (2019). Structural dependence of chemical durability in modified aluminoborate glasses. Journal of the American Ceramic Society, 102(3), 1157-1168. https://doi.org/10.1111/jace.15969