Influence of Extrusion Temperature on the Thermoelectric Properties of p-Type Ag Added (Bi0.25Sb0.75)2Te3 Alloys Prepared by MA-PDS
The direct extrusion process using the powder as raw materials was applied to prepare the thermoelectric materials. The mechanically alloyed powders of Ag added (Bi0.25Sb0.75)2Te3 were extruded by pulse discharge sintering method in the temperature range of 345°C ~ 425°C. High quality products were obtained by hot-extrusion method and their texture and thermoelectric properties were measured. The intensity of (110) plane increased with extrusion temperature up to 385°C and altered in the range of above 405°Cwhich coincided with the variation of power factor. The measured Power factor ranged from 3.5 ~ 4.0 × 10-3 W/K2·m. The figure of merit (Z) of the material extruded at 385°C was 3.1 × 10-3 /K, the highest value among the prepared materials.
Wei Pan and Jianghong Gong
W. K. Min et al., "Influence of Extrusion Temperature on the Thermoelectric Properties of p-Type Ag Added (Bi0.25Sb0.75)2Te3 Alloys Prepared by MA-PDS", Key Engineering Materials, Vols. 336-338, pp. 846-849, 2007