Thermoelectric Properties of Bismuth Telluride Based Materials Prepared by Powder Metallurgy Processing
Polycrystalline samples of Bi2Te3 based alloys were prepared by powder metallurgy processing including a melting-grinding and a sintering procedure of compacted pellets. Two sintering procedures as hot-pressing and spark plasma sintering (SPS) were employed. The thermoelectric properties and mechanical strength were measured in all case. Thermoelectric properties for p-type (Bi0.25Sb0.75)2Te3 and n-type Bi2(Te0.2Se0.8)3 changed with sintering temperature in both sintering methods. Mechanical strength and relative density increase with sintering temperature in two sintering procedures. The results firmly suggest that both sintering procedures are promising to obtain high performance thermoelectric materials.
Wei Pan and Jianghong Gong
W. Ren et al., "Thermoelectric Properties of Bismuth Telluride Based Materials Prepared by Powder Metallurgy Processing", Key Engineering Materials, Vols. 336-338, pp. 864-867, 2007