Short- and medium-range structure synergistically control fracture toughness of densified aluminoborate glasses

Elsebeth Juhl Pedersen, Theany To, Søren Strandskov Sørensen, Rasmus Christensen, Johan Frederik Schou Christensen, Lars Rosgaard Jensen, Michal Bockowski, Oxana Magdysyuk, Maria Diaz-Lopez, Yuanzheng Yue, Morten Mattrup Smedskjær*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)


Methods to improve the fracture toughness of oxide glasses are needed since low fracture toughness is a major bottleneck for their applications. To overcome this, it is critically important to investigate the effect of both short- and medium-range structural features on fracture toughness. Recent work reported a record-high fracture toughness for a bulk lithium aluminoborate glass subjected to hot compression. Here, we further explore the structural origin of this high fracture toughness by subjecting different alkali aluminoborate glasses to hot compression. Through a combination of x-ray total scattering experiments and atomistic simulations, we find that hot compression causes significant changes to both the short- and medium-range order structure of the glasses, e.g., increased coordination numbers (CNs) of network forming species and decreased average size of ring-type structures. To this end, we reveal positive correlations between the pressure-induced increase in fracture toughness and (i) the increase in average CN of network forming species and (ii) the area of the first sharp diffraction peak in the structure factor. Our study thus improves the understanding of which structural features benefit intrinsic toughening of oxide glasses.

Original languageEnglish
Article number053607
JournalPhysical Review Materials
Issue number5
Publication statusPublished - 16 May 2023


Dive into the research topics of 'Short- and medium-range structure synergistically control fracture toughness of densified aluminoborate glasses'. Together they form a unique fingerprint.

Cite this