The thermal effusivities of the AlO 1.5-R 2 O-SiO 2 (R=Li, Na) melts were measured by the front-heating front-detection laser flash method. The thermal conductivities of the AlO 1.5-R 2 O-SiO 2 melts were tentatively determined from the specific heat capacities and bulk densities. In these results, the thermal conductivities were almost constant over the temperature range investigated. It was found that the thermal conductivity of AlO 1.5-Li 2 O-SiO 2 melt was larger than that of AlO 1.5-Na 2 O-SiO 2 melt. It was also found that the thermal conductivities were increased with AlO 1.
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