Radiative thermal conduction of molten tin sulfide estimated from its optical emission spectrum

Abstract

Molten semi-conductors have potential utility in thermoelectrics or heat-management at high temperature (900°C and above), though their development requires further analysis of their thermal conduction mechanisms, in particular radiative heat-transfer. Using a container-less method based on the floating zone furnace, the optical emission properties of a pendant droplet of molten tin sulfide (SnS) are investigated in the UV-visible (200-850 nm) and near IR (900-2050 nm) ranges. The emissivity results suggest a low emissivity for molten SnS at the peak of radiation for the temperature range of 890 to 950 °C. Corresponding estimates of radiative thermal conductivity suggest its minor contribution to the overall thermal conduction of molten SnS.