Bechgaard, Tobias Kjær

Bockowski, Michal

Goel, Ashutosh

Jensen, Lars Rosgaard

Mauro, John C.

Rzoska, Sylwester J.

Smedskjær, Morten Mattrup

Youngman, Randall E.

    Aalborg UniversitetStructure and Mechanical Properties of Compressed Sodium Aluminosilicate GlassesBechgaard, Tobias Kjær; Goel, Ashutosh; Youngman, Randall E.; Mauro, John C.; Rzoska,Sylwester J.; Bockowski, Michal; Jensen, Lars Rosgaard; Smedskjær, Morten MattrupPublication date:2016Link to publication from Aalborg UniversityCitation for published version (APA):Bechgaard, T. K., Goel, A., Youngman, R. E., Mauro, J. C., Rzoska, S. J., Bockowski, M., ... Smedskjær, M. M.(2016). Structure and Mechanical Properties of Compressed Sodium Aluminosilicate Glasses. Abstract fromMaterials Science & Technology 2016, Salt Lake City, United States.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: May 01, 2017Structure and Mechanical Properties of Compressed Sodium Aluminosilicate Glasses Tobias K. Bechgaard1, Ashutosh Goel2, Randall E. Youngman3, John C. Mauro3, Sylwester J. Rzoska4, Michal Bockowski4, Lars R. Jensen5, Morten M. Smedskjaer1 1 Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark 2 Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA 3 Science and Technology Division, Corning Incorporated, Corning, USA 4 Institute of High-Pressure Physics, Polish Academy of Sciences, Warsaw, Poland 5 Department of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg, Denmark  Understanding the effect of pressure on the structure of aluminosilicate glasses is important for understanding the densification mechanism of these materials under pressure and the corresponding changes in macroscopic properties. Here, we study pressure-induced changes in density, network structure, indentation hardness, and crack resistance of sodium aluminosilicate glasses with varying Al/Si ratio and thus non-bridging oxygen (NBO) content before and after isostatic compression at 1 GPa at Tg. The effect of increasing NBO content is network depolymerization, higher atomic packing factor, lower hardness, and higher crack resistance. High-NBO glasses have a larger ability to densify upon compression and exhibit larger pressure-induced changes in mechanical properties. The 27Al NMR data show a surprising presence of five-fold aluminum in the as-made high-NBO glasses, with additional formation upon compression. Our study therefore provides insights into the relationship between Al coordination and NBO content in aluminosilicate glasses and how it affects their densification behavior. 

Structure and Mechanical Properties of Compressed Sodium Aluminosilicate Glasses

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Structure and Mechanical Properties of Compressed Sodium Aluminosilicate Glasses

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