# Thermal conductivity of densified borosilicate glasses

Søren Strandskov Sørensen, Mikkel Sandfeld Bødker, Hicham Johra, Randall E. Youngman, Stephan L. Logunov, Michal Bockowski, Sylwester J. Rzoska, John C. Mauro, Morten Mattrup Smedskjær*

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

## Abstrakt

In this work, we study the thermal conductivity of densified soda lime borosilicate glasses with varying B2O3/SiO2 ratio. Densification is induced by hot compression up to 2 GPa at the glass transition temperature. We find that the structural and mechanical properties of the glasses exhibit a similar response to hot compression as other oxide glasses, including increasing density, elastic moduli, and fraction of four-coordinated boron across the full compositional range. Generally, we find that thermal conductivity increases upon densification, but with a pronounced composition dependence, as silica-rich glasses exhibit only a minor increase (~8-10%) while borate-rich glasses exhibit a significant increase (>50%). We rationalize these variations in terms of topological constraint theory by showing a connection between the contribution of propagative vibrational modes to heat transfer and the volumetric constraint density across both as-made and densified samples. These findings thus provide insights into the linkages between structure and thermal conductivity.

Originalsprog Engelsk 120644 Journal of Non-Crystalline Solids 557 9 0022-3093 https://doi.org/10.1016/j.jnoncrysol.2021.120644 Udgivet - apr. 2021

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