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Abstract
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.
Original language | English |
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Article number | 120644 |
Journal | Journal of Non-Crystalline Solids |
Volume | 557 |
Number of pages | 9 |
ISSN | 0022-3093 |
DOIs | |
Publication status | Published - Apr 2021 |
Keywords
- Borosilicates
- Hot compression
- Oxide glasses
- Thermal conductivity
- Topological constraint theory
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Dive into the research topics of 'Thermal conductivity of densified borosilicate glasses'. Together they form a unique fingerprint.Projects
- 1 Finished
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Fundamentals of Thermal Properties of Oxide Glasses
Smedskjær, M. M., Sørensen, S. S. & Johra, H.
01/09/2018 → 31/08/2022
Project: Research