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

Abstract

In this work, we study the thermal conductivity of densified soda lime borosilicate glasses with varying B 2 O 3 /SiO 2 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.

Topics

• density
• impedance spectroscopy
• theory
• glass
• glass
• glass transition temperature
• Boron
• thermal conductivity
• densification
• lime