Thermal Conductivity of Infrared Transparent Chalcogenide Glasses

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Abstract
Chalcogenide glasses exhibit low thermal conductivities on the order of 10‐3 W cm‐1K‐1. Since many of these glasses are transparent in the infrared, the photon contribution to the apparent thermal conductivity of these materials can be significant even at relatively low temperatures, The temperature‐dependent thermal conductivity of Ge28 Sb12 Se60 was measured over the range 175 to 475 K and a simplified approach is presented to correct the data for radiation (photon) effects. In addition, room‐temperature thermal conductivities of 13 other glass compositions were measured. The phonon conductivities agreed well with simple Debye theory predictions after the radiation contributions were eliminated.