Effect of boron oxide on the thermal conductivity of some sodium silicate glasses

The thermal conductivity of some ternary silicate glasses was measured by the steady-state method at 25°C. Experimental results show that introducing B₂O₃ to replace Na₂O or increasing the SiO₂ content of the glass increased the thermal conductivity. The results are discussed in terms of the possible variation in network structure with the change in glass composition, which may virtually affect the phonon mean-free-path.