Effect of Sintering Temperature on Electrical Transport Properties of Bi0.5Sb1.5Te3 Thermoelectric Materials

Bi
0.5
Sb
1.5
Te
3
thermoelectric materials were successfully obtained by vacuum solid-state reaction sintering method. The effects of different sintering temperatures on the electrical transport properties of Bi
0.5
Sb
1.5
Te
3
thermoelectric materials were investigated. The results show that the Seebeck coefficient of Bi
0.5
Sb
1.5
Te
3
compound increases first and then decreases with the increase of sintering temperature. The resistivity of Bi
0.5
Sb
1.5
Te
3
compound changes in wave shape with the increasing sintering temperature. The resistivity of Bio.5Sb1.5Te3 compound reaches the minimum value when the sintering temperature is 823K. With the increasing sintering temperature, the PF value of Bi
0.5
Sb
1.5
Te
3
compound increases first and then decreases. The PF value of Bi
0.5
Sb
1.5
Te
3
compound reaches the maximum value when the sintering temperature is 823K. Under five sintering temperature conditions of 723K, 773K, 823K, 873K, and 923K, the Bio.5Sb1.5Te3 compound prepared at 823K has the best electrical transport performance. When the sintering temperature is 823K, the Seebeck coefficient, resistivity and PF value of Bio.5Sb1.5Te3 compound are 231.893μV-K
^-1
, 3.28mΩ•cm, 1639.46pW•m
^-1
•K
^-2
, respectively.