LnPdSb and Ln_3Au_3Sb_4: new thermoelectric materials

摘要

The thermoelectric properties near ambient temperature of helf-heusler alloys based on HoPdSb, DyPdSb, and ErPdSb are reorted. The Seebeck coefficients are between 60 and 250 mu U/K. The resistivities range between 0.6 and 20 m OMEGA cm, and the majority carriers are p-type. Thermal conductivities are smallest in intentionally disordered materials. The highest ambient temperature ZT obtained is 0.06. Band structure calculations are presented, and are compared to those for ZrNiSn. It is suggest4d that half-Heusler alloys with 18 electrons per formula unit may represent a large calss of thermoelectric materials. The thermoelectric properties of another family o f cubic symmetry antimonides, based on Ho_3Au_3Sb_4 and Sm_3Sb_4, are also reported.