Thermoelectric and transport properties of sintered n-type K8Ba16Ga40Sn96 with type-II clathrate structure

摘要: This clathrate had a maximum dimensionless figure-of-merit, ZT, of 0.93 at 637 K, which was slightly higher than that 0.83 for the sintered type-VIII Ba8Ga16Sn30. We investigated high-temperature thermoelectric properties, transport electronic structures, and thermal stabilities clathrates. The type-II found to be superior as material; it high stability melting point, 859 K, mobility, 141 cm2V−1s−1 300 K, because its low inertial mass, lattice conductivity, approximately 4 mW cm−1K−1, resulting from larger unit cell weaker bipolar conduction. discuss these properties in terms structure differences between two types clathrate.