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Abstract: Clathrates are thermoelectric materials that are used in waste heat recovery applications. This study tested the thermophysical properties of the n-doped clathrate Ba8Ga16Ge30 after gallium (Ga) and germanium (Ge) substituted antimony (Sb) and zinc (Zn). A TPS instrument measured the thermal conductivity of n-Ba8Ga16Ge30 with the transient plane source (TPS) method. Results showed that for almost every sample, thermal conductivity decreased inversely to temperature, then increased slightly at the highest temperatures. The Ba8Ga15Sb1Ge30 sample had the highest thermal conductivity, therefore the most advantageous substitution was Zn with Sb.

Reference: Journal of Applied Physics, 108 (2010) 113711-113711-5

DOI: 10.1063/1.3518043