TY - JOUR
T1 - Thermal conductivity of densified borosilicate glasses
AU - Sørensen, Søren S.
AU - Bødker, Mikkel S.
AU - Johra, Hicham
AU - Youngman, Randall E.
AU - Logunov, Stephan L.
AU - Bockowski, Michal
AU - Rzoska, Sylwester J.
AU - Mauro, John C.
AU - Smedskjaer, Morten M.
N1 - Publisher Copyright:
© 2021
PY - 2021/4/1
Y1 - 2021/4/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jnoncrysol.2021.120644
DO - 10.1016/j.jnoncrysol.2021.120644
M3 - Article
AN - SCOPUS:85100385964
SN - 0022-3093
VL - 557
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 120644
ER -