Thermal conductivity of silica glass at high temperature by molecular dynamics simulation

We have evaluated the thermal conductivity in SiO2 glass at elevated temper ature by Molecular Dynamics (MD) calculation and the Green-Kubo formula in an equilibrium state using the purely ionic pair interaction potential func tions. The estimated uncertainty for the thermal conductivity was +/-25% at 981 K and +/-8% at 1978 K. Our results were in agreement with those of the experiment by Wray and Connolly within 20-35% at 981:1978 K. The calculate d thermal conductivity showed a positive temperature dependence, which also agreed with the experimental results. It was found that the calculated val ues did not depend on total ion number in the system. We have concluded tha t semiquantitatively reliable results were given by the present MD calculat ion with the potential functions.