Synthesis and Transport Properties of Polycrystalline Co-Filled Type-I Clathrate Compound (Sr,Ba)8Ga16Ge30
Ga-substituted Ge based type-I clathrates with the general formula A8X16Y30 display promising thermoelectric performance. Using high purity elemental Sr, Ba, Ga, and Ge as starting materials, polycrystalline co-filled type-I clathrate compound (Sr,Ba)8Ga16Ge30 were successfully achieved by combining melting and Spark Plasma Sinter (SPS) method. The temperature dependence of thermal conductivity, electronic conductivity and Seebeck coefficient were reported. The calculated ZTmax is 0.28 at 700K. Enhanced thermoelectric performance would be expected through adjusting Sr/Ba ratio and framework atoms.
Zhong Wei Gu, Yafang Han, Fu Sheng Pan, Xitao Wang, Duan Weng and Shaoxiong Zhou
L. Wang et al., "Synthesis and Transport Properties of Polycrystalline Co-Filled Type-I Clathrate Compound (Sr,Ba)8Ga16Ge30", Materials Science Forum, Vols. 610-613, pp. 441-445, 2009