Competitive effects of modifier charge and size on mechanical and chemical resistance of aluminoborate glasses

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)

Resumé

Lithium aluminoborate glasses exhibit high resistance to cracking under contact loading, but low hardness and poor chemical durability in aqueous media. On the other hand, alkaline earth aluminoborate glasses feature improved chemical resistance and hardness, but lower resistance to cracking. In this work, we investigate the possibility to simultaneously improve the mechanical and chemical resistance of aluminoborate glasses by mixing alkali and alkaline earth modifiers. We study the mixed Li/Ba and Li/Mg aluminoborate glasses, since Li + and Ba 2+ have different charge and size but similar modifier field strength (charge to size ratio), while Mg 2+ has the highest field strength among these modifiers due to its small size. The two glass series will thus give insights into the competitive effects of modifier charge and size on glass structure, mechanical properties, and dissolution rates in acidic, neutral, and basic solutions. The substitution of barium for lithium at fixed [Al 2O 3]/[B 2O 3] ratio does not affect the network structure and properties, such as hardness and dissolution rate. However, the substitution of magnesium for lithium leads to an increase in hardness and chemical durability for all pH solutions (2, 7, and 14), likely as a result of the increase in the fractions of five- and six-fold coordinated aluminum species and atomic packing density. The glass with 5 mol% Li 2O and 20 mol% MgO exhibits the best combination of high hardness and low dissolution rate, while maintaining a good crack-resistance comparable to that of the Li-aluminoborate glass. In both mixed glass series, the lowest dissolution rates are measured in neutral solutions, while those in acidic and especially basic media are higher. The structural origins of the trends in chemical and mechanical properties are discussed based on 11B and 27Al nuclear magnetic resonance (NMR) spectroscopy measurements.

OriginalsprogEngelsk
TidsskriftJournal of Non-Crystalline Solids
Vol/bind499
Sider (fra-til)264-271
Antal sider8
ISSN0022-3093
DOI
StatusUdgivet - 1 nov. 2018

Fingerprint

Chemical resistance
Glass
glass
hardness
Hardness
dissolving
Dissolution
Lithium
lithium
durability
field strength
Durability
Substitution reactions
Earth (planet)
mechanical properties
substitutes
Mechanical properties
packing density
magnetic resonance spectroscopy
low resistance

Citer dette

@article{f5a9f10b456042588eac4097208bc983,
title = "Competitive effects of modifier charge and size on mechanical and chemical resistance of aluminoborate glasses",
abstract = "Lithium aluminoborate glasses exhibit high resistance to cracking under contact loading, but low hardness and poor chemical durability in aqueous media. On the other hand, alkaline earth aluminoborate glasses feature improved chemical resistance and hardness, but lower resistance to cracking. In this work, we investigate the possibility to simultaneously improve the mechanical and chemical resistance of aluminoborate glasses by mixing alkali and alkaline earth modifiers. We study the mixed Li/Ba and Li/Mg aluminoborate glasses, since Li + and Ba 2+ have different charge and size but similar modifier field strength (charge to size ratio), while Mg 2+ has the highest field strength among these modifiers due to its small size. The two glass series will thus give insights into the competitive effects of modifier charge and size on glass structure, mechanical properties, and dissolution rates in acidic, neutral, and basic solutions. The substitution of barium for lithium at fixed [Al 2O 3]/[B 2O 3] ratio does not affect the network structure and properties, such as hardness and dissolution rate. However, the substitution of magnesium for lithium leads to an increase in hardness and chemical durability for all pH solutions (2, 7, and 14), likely as a result of the increase in the fractions of five- and six-fold coordinated aluminum species and atomic packing density. The glass with 5 mol{\%} Li 2O and 20 mol{\%} MgO exhibits the best combination of high hardness and low dissolution rate, while maintaining a good crack-resistance comparable to that of the Li-aluminoborate glass. In both mixed glass series, the lowest dissolution rates are measured in neutral solutions, while those in acidic and especially basic media are higher. The structural origins of the trends in chemical and mechanical properties are discussed based on 11B and 27Al nuclear magnetic resonance (NMR) spectroscopy measurements.",
author = "{Mascaraque Alvarez}, Nerea and Frederiksen, {Anne Kristine F.} and Kacper Januchta and Youngman, {Randall E.} and Mathieu Bauchy and Smedskj{\ae}r, {Morten Mattrup}",
year = "2018",
month = "11",
day = "1",
doi = "10.1016/j.jnoncrysol.2018.07.034",
language = "English",
volume = "499",
pages = "264--271",
journal = "Journal of Non-Crystalline Solids",
issn = "0022-3093",
publisher = "Elsevier",

}

Competitive effects of modifier charge and size on mechanical and chemical resistance of aluminoborate glasses. / Mascaraque Alvarez, Nerea; Frederiksen, Anne Kristine F.; Januchta, Kacper; Youngman, Randall E.; Bauchy, Mathieu; Smedskjær, Morten Mattrup.

I: Journal of Non-Crystalline Solids, Bind 499, 01.11.2018, s. 264-271.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Competitive effects of modifier charge and size on mechanical and chemical resistance of aluminoborate glasses

AU - Mascaraque Alvarez, Nerea

AU - Frederiksen, Anne Kristine F.

AU - Januchta, Kacper

AU - Youngman, Randall E.

AU - Bauchy, Mathieu

AU - Smedskjær, Morten Mattrup

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Lithium aluminoborate glasses exhibit high resistance to cracking under contact loading, but low hardness and poor chemical durability in aqueous media. On the other hand, alkaline earth aluminoborate glasses feature improved chemical resistance and hardness, but lower resistance to cracking. In this work, we investigate the possibility to simultaneously improve the mechanical and chemical resistance of aluminoborate glasses by mixing alkali and alkaline earth modifiers. We study the mixed Li/Ba and Li/Mg aluminoborate glasses, since Li + and Ba 2+ have different charge and size but similar modifier field strength (charge to size ratio), while Mg 2+ has the highest field strength among these modifiers due to its small size. The two glass series will thus give insights into the competitive effects of modifier charge and size on glass structure, mechanical properties, and dissolution rates in acidic, neutral, and basic solutions. The substitution of barium for lithium at fixed [Al 2O 3]/[B 2O 3] ratio does not affect the network structure and properties, such as hardness and dissolution rate. However, the substitution of magnesium for lithium leads to an increase in hardness and chemical durability for all pH solutions (2, 7, and 14), likely as a result of the increase in the fractions of five- and six-fold coordinated aluminum species and atomic packing density. The glass with 5 mol% Li 2O and 20 mol% MgO exhibits the best combination of high hardness and low dissolution rate, while maintaining a good crack-resistance comparable to that of the Li-aluminoborate glass. In both mixed glass series, the lowest dissolution rates are measured in neutral solutions, while those in acidic and especially basic media are higher. The structural origins of the trends in chemical and mechanical properties are discussed based on 11B and 27Al nuclear magnetic resonance (NMR) spectroscopy measurements.

AB - Lithium aluminoborate glasses exhibit high resistance to cracking under contact loading, but low hardness and poor chemical durability in aqueous media. On the other hand, alkaline earth aluminoborate glasses feature improved chemical resistance and hardness, but lower resistance to cracking. In this work, we investigate the possibility to simultaneously improve the mechanical and chemical resistance of aluminoborate glasses by mixing alkali and alkaline earth modifiers. We study the mixed Li/Ba and Li/Mg aluminoborate glasses, since Li + and Ba 2+ have different charge and size but similar modifier field strength (charge to size ratio), while Mg 2+ has the highest field strength among these modifiers due to its small size. The two glass series will thus give insights into the competitive effects of modifier charge and size on glass structure, mechanical properties, and dissolution rates in acidic, neutral, and basic solutions. The substitution of barium for lithium at fixed [Al 2O 3]/[B 2O 3] ratio does not affect the network structure and properties, such as hardness and dissolution rate. However, the substitution of magnesium for lithium leads to an increase in hardness and chemical durability for all pH solutions (2, 7, and 14), likely as a result of the increase in the fractions of five- and six-fold coordinated aluminum species and atomic packing density. The glass with 5 mol% Li 2O and 20 mol% MgO exhibits the best combination of high hardness and low dissolution rate, while maintaining a good crack-resistance comparable to that of the Li-aluminoborate glass. In both mixed glass series, the lowest dissolution rates are measured in neutral solutions, while those in acidic and especially basic media are higher. The structural origins of the trends in chemical and mechanical properties are discussed based on 11B and 27Al nuclear magnetic resonance (NMR) spectroscopy measurements.

U2 - 10.1016/j.jnoncrysol.2018.07.034

DO - 10.1016/j.jnoncrysol.2018.07.034

M3 - Journal article

VL - 499

SP - 264

EP - 271

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

ER -