首页|Role of Pb Doping on the Thermoelectric Properties of Mg3Sb1.8‐yBi0.2Pby Alloys
Role of Pb Doping on the Thermoelectric Properties of Mg3Sb1.8‐yBi0.2Pby Alloys
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NSTL
Wiley
Abstract In this work, we focused on the matrix material with a composition of Mg3Sb1.8Bi0.2. The effect of Pb doping on the thermoelectric properties of Mg3Sb1.8‐yBi0.2Pby (y=0, 0.005, 0.01, 0.02) compounds was investigated. Mechanical alloying followed by spark plasma sintering was employed to synthesize the corresponding bulk materials. The x‐ray diffraction results indicate that the doping limit of Pb in Mg3Sb1.8Bi0.2 is 0.01～0.02. Pb doping significantly increases the carrier concentration up to >1019?cm?3, while decreasing the Seebeck coefficient. Moreover, the thermal conductivity of the matrix material is reduced upon Pb doping at 400–700?K. As a result, the thermoelectric figure of merit is improved in the low‐temperature range, and a ZT value of 0.039 is obtained for the y=0.005 sample at 500?K, which is 77% higher than that of the undoped sample.
Bi alloyingMg3Sb2Pb dopingthermoelectric propertiesthermal conductivity
Bo Zhu、Xu Lu、Lianglu Hu、Qiang Zhang、Lifei Wang、Yun Zheng、Jianfeng Fan
NSTL
Wiley
