Permanent Densification of Calcium Aluminophosphate Glasses

Saurabh Kapoor*, Randall E. Youngman, Lina Ma, Nadja Lönnroth, Sylwester J. Rzoska, Michal Bockowski, Lars Rosgaard Jensen, Mathieu Bauchy, Morten Mattrup Smedskjær

*Kontaktforfatter

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Resumé

High-temperature densification of oxide glasses influences their interatomic distances and bonding patterns, resulting in changes in the mechanical and chemical properties. Most high-pressure investigations have focused on aluminosilicate and aluminoborosilicate based glasses, due to their relevance for the glass industry as well as the geological sciences. Relatively few studies have explored the pressure-induced changes in the structure and properties of phosphate-based glasses, although P 2O 5 is an important component in various multicomponent oxide glasses of industrial interest. In this work, we investigate the influence of permanent densification on the structure, mechanical properties (Vicker's hardness), and chemical durability (weight loss in water) of binary CaO-P 2O 5 and ternary CaO-Al 2O 3-P 2O 5 glasses. The densification of bulk glasses is obtained through isostatic compression (1–2 GPa) at the glass transition temperature. The binary CaO-P 2O 5 series is prepared with varying [CaO]/[P 2O 5] ratios to obtain glasses with different O/P ratios, while the ternary series CaO-Al 2O 3-P 2O 5 is prepared with a constant O/P ratio of 3 (metaphosphate) but with varying [CaO]/([CaO]+[Al 2O 3]) ratio. Using Raman and 31P NMR spectroscopy, we observe minor, yet systematic and composition-dependent changes in the phosphate network connectivity upon compression. On the other hand, 27Al NMR analysis of the compressed CaO-Al 2O 3-P 2O 5 glasses highlights an increase in the Al coordination number. We discuss these structural changes in relation to the pressure-induced increase in density, Vicker's hardness, and chemical durability.

OriginalsprogEngelsk
Artikelnummer63
TidsskriftFrontiers in Materials
Vol/bind6
Antal sider13
ISSN2296-8016
DOI
StatusUdgivet - 15 apr. 2019

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Densification
Calcium
Glass
Vickers hardness
Oxides
Phosphates
Durability
Glass industry
Mechanical properties
Aluminosilicates
Chemical properties
Nuclear magnetic resonance spectroscopy
Compaction
Nuclear magnetic resonance
Water
Chemical analysis

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Kapoor, S., Youngman, R. E., Ma, L., Lönnroth, N., Rzoska, S. J., Bockowski, M., ... Smedskjær, M. M. (2019). Permanent Densification of Calcium Aluminophosphate Glasses. Frontiers in Materials, 6, [63]. https://doi.org/10.3389/fmats.2019.00063
Kapoor, Saurabh ; Youngman, Randall E. ; Ma, Lina ; Lönnroth, Nadja ; Rzoska, Sylwester J. ; Bockowski, Michal ; Jensen, Lars Rosgaard ; Bauchy, Mathieu ; Smedskjær, Morten Mattrup. / Permanent Densification of Calcium Aluminophosphate Glasses. I: Frontiers in Materials. 2019 ; Bind 6.
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title = "Permanent Densification of Calcium Aluminophosphate Glasses",
abstract = "High-temperature densification of oxide glasses influences their interatomic distances and bonding patterns, resulting in changes in the mechanical and chemical properties. Most high-pressure investigations have focused on aluminosilicate and aluminoborosilicate based glasses, due to their relevance for the glass industry as well as the geological sciences. Relatively few studies have explored the pressure-induced changes in the structure and properties of phosphate-based glasses, although P 2O 5 is an important component in various multicomponent oxide glasses of industrial interest. In this work, we investigate the influence of permanent densification on the structure, mechanical properties (Vicker's hardness), and chemical durability (weight loss in water) of binary CaO-P 2O 5 and ternary CaO-Al 2O 3-P 2O 5 glasses. The densification of bulk glasses is obtained through isostatic compression (1–2 GPa) at the glass transition temperature. The binary CaO-P 2O 5 series is prepared with varying [CaO]/[P 2O 5] ratios to obtain glasses with different O/P ratios, while the ternary series CaO-Al 2O 3-P 2O 5 is prepared with a constant O/P ratio of 3 (metaphosphate) but with varying [CaO]/([CaO]+[Al 2O 3]) ratio. Using Raman and 31P NMR spectroscopy, we observe minor, yet systematic and composition-dependent changes in the phosphate network connectivity upon compression. On the other hand, 27Al NMR analysis of the compressed CaO-Al 2O 3-P 2O 5 glasses highlights an increase in the Al coordination number. We discuss these structural changes in relation to the pressure-induced increase in density, Vicker's hardness, and chemical durability.",
keywords = "Chemical durability, Hot compression, Oxide glass, Structure-property relationship, Vickers micro hardness",
author = "Saurabh Kapoor and Youngman, {Randall E.} and Lina Ma and Nadja L{\"o}nnroth and Rzoska, {Sylwester J.} and Michal Bockowski and Jensen, {Lars Rosgaard} and Mathieu Bauchy and Smedskj{\ae}r, {Morten Mattrup}",
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Kapoor, S, Youngman, RE, Ma, L, Lönnroth, N, Rzoska, SJ, Bockowski, M, Jensen, LR, Bauchy, M & Smedskjær, MM 2019, 'Permanent Densification of Calcium Aluminophosphate Glasses', Frontiers in Materials, bind 6, 63. https://doi.org/10.3389/fmats.2019.00063

Permanent Densification of Calcium Aluminophosphate Glasses. / Kapoor, Saurabh; Youngman, Randall E.; Ma, Lina; Lönnroth, Nadja; Rzoska, Sylwester J.; Bockowski, Michal; Jensen, Lars Rosgaard; Bauchy, Mathieu; Smedskjær, Morten Mattrup.

I: Frontiers in Materials, Bind 6, 63, 15.04.2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Permanent Densification of Calcium Aluminophosphate Glasses

AU - Kapoor, Saurabh

AU - Youngman, Randall E.

AU - Ma, Lina

AU - Lönnroth, Nadja

AU - Rzoska, Sylwester J.

AU - Bockowski, Michal

AU - Jensen, Lars Rosgaard

AU - Bauchy, Mathieu

AU - Smedskjær, Morten Mattrup

PY - 2019/4/15

Y1 - 2019/4/15

N2 - High-temperature densification of oxide glasses influences their interatomic distances and bonding patterns, resulting in changes in the mechanical and chemical properties. Most high-pressure investigations have focused on aluminosilicate and aluminoborosilicate based glasses, due to their relevance for the glass industry as well as the geological sciences. Relatively few studies have explored the pressure-induced changes in the structure and properties of phosphate-based glasses, although P 2O 5 is an important component in various multicomponent oxide glasses of industrial interest. In this work, we investigate the influence of permanent densification on the structure, mechanical properties (Vicker's hardness), and chemical durability (weight loss in water) of binary CaO-P 2O 5 and ternary CaO-Al 2O 3-P 2O 5 glasses. The densification of bulk glasses is obtained through isostatic compression (1–2 GPa) at the glass transition temperature. The binary CaO-P 2O 5 series is prepared with varying [CaO]/[P 2O 5] ratios to obtain glasses with different O/P ratios, while the ternary series CaO-Al 2O 3-P 2O 5 is prepared with a constant O/P ratio of 3 (metaphosphate) but with varying [CaO]/([CaO]+[Al 2O 3]) ratio. Using Raman and 31P NMR spectroscopy, we observe minor, yet systematic and composition-dependent changes in the phosphate network connectivity upon compression. On the other hand, 27Al NMR analysis of the compressed CaO-Al 2O 3-P 2O 5 glasses highlights an increase in the Al coordination number. We discuss these structural changes in relation to the pressure-induced increase in density, Vicker's hardness, and chemical durability.

AB - High-temperature densification of oxide glasses influences their interatomic distances and bonding patterns, resulting in changes in the mechanical and chemical properties. Most high-pressure investigations have focused on aluminosilicate and aluminoborosilicate based glasses, due to their relevance for the glass industry as well as the geological sciences. Relatively few studies have explored the pressure-induced changes in the structure and properties of phosphate-based glasses, although P 2O 5 is an important component in various multicomponent oxide glasses of industrial interest. In this work, we investigate the influence of permanent densification on the structure, mechanical properties (Vicker's hardness), and chemical durability (weight loss in water) of binary CaO-P 2O 5 and ternary CaO-Al 2O 3-P 2O 5 glasses. The densification of bulk glasses is obtained through isostatic compression (1–2 GPa) at the glass transition temperature. The binary CaO-P 2O 5 series is prepared with varying [CaO]/[P 2O 5] ratios to obtain glasses with different O/P ratios, while the ternary series CaO-Al 2O 3-P 2O 5 is prepared with a constant O/P ratio of 3 (metaphosphate) but with varying [CaO]/([CaO]+[Al 2O 3]) ratio. Using Raman and 31P NMR spectroscopy, we observe minor, yet systematic and composition-dependent changes in the phosphate network connectivity upon compression. On the other hand, 27Al NMR analysis of the compressed CaO-Al 2O 3-P 2O 5 glasses highlights an increase in the Al coordination number. We discuss these structural changes in relation to the pressure-induced increase in density, Vicker's hardness, and chemical durability.

KW - Chemical durability

KW - Hot compression

KW - Oxide glass

KW - Structure-property relationship

KW - Vickers micro hardness

UR - http://www.scopus.com/inward/record.url?scp=85067418688&partnerID=8YFLogxK

U2 - 10.3389/fmats.2019.00063

DO - 10.3389/fmats.2019.00063

M3 - Journal article

VL - 6

JO - Frontiers in Materials

JF - Frontiers in Materials

SN - 2296-8016

M1 - 63

ER -

Kapoor S, Youngman RE, Ma L, Lönnroth N, Rzoska SJ, Bockowski M et al. Permanent Densification of Calcium Aluminophosphate Glasses. Frontiers in Materials. 2019 apr 15;6. 63. https://doi.org/10.3389/fmats.2019.00063