We have investigated thermoelectric properties of p type Bi Te thermoelectric material doped with PbTe. The samples (Bi 2 Te 3 ) 0.2 (Sb 2 Te 3 ) 0.8 +xmassPbTe(x=0, 0.05, 0.1 , 0.3, 0.5) were fabricated by mechanical alloying and spark plasma sintering(SPS) method. The Seebeck coefficient(a), the electric conductivity(s) and the thermal conductivity(k) were measured in the temperature range 323 523 K. The a decreased and the s increased with increasing PbTe content. The dimensionless figure of merit(ZT) were calculated. The maximum point of the ZT shifted toward higher temperature with increasing PbTe content. The maximum ZT of 1.12 was obtained for x=0.3 sample at 373 K.
We have investigated the thermoelectric properties of p-type Bi-Te thermoelectric material doped with PbTe. The samples (BiZTe3)o.z(SbzTe3)o.8 +xwt%PbTe (x=O, 0.05, 0.1,0.3, 0.5) were fabricated by the mechanical alloying (MA) and spark plasma sintering (SPS) method. The Seebeck coefficient (a), the electric conductivity (a), the Hall carrier concentration (np) and the thermal conductivity (K) were measured in the temperature range 323-523K. The maximum value of the Seebeck coefficient shifted toward a higher temperature with increasing PbTe content. The electric conductivity increased with increasing PbTe content.Although, the values of thermal conductivity of x=0.05, 0.1 samples were increased monotonously with increasing temperature, x=0.3, 0.5 samples showed minimum value then increased with temperature. The dimensionless figure of merit ZT and average ZT were calculated in temperature range 323-523K. The maximum ZT of 1.12 was obtained for x=0.3 sample at 373K. The maximum value of the average ZT was 1.02 for x=0.3 sample.
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