Enhanced thermoelectric properties of Sn0.8Pb0.2Te alloy by Mn substitution
A series of (Sn0.8Pb0.2)1-xMnxTe alloys with x =0, 0.03, 0.06, 0.09, 0.12 and 0.15 were prepared by melting, quenching and spark plasma sintering (SPS) techniques.Mn was used as doped element in Sn0.8Pb0.2Te solid solution to reduce the carrier concentration, enhance the Seebeck coefficient and reduce the thermal conductivity of the material.Experimental results show that the single SnTe-based solid solutions were formed in the alloys with x =0 to 0.03.The minor block-like MnTe2 phase presents in the alloy with x 0.06, while the minor needle-like MnTe phase appears in the alloy with x 0.12, together with the SnTe-based solid solution matrix.The lattice parameter a of SnTe-based solid solution decreases linearly as Mn content x increases up to 0.12, but keeps a constant as x further increases.All the samples show p-type conduction.Mn doping decreases the carrier concentration and thus increases the Seebeck coefficient.The solute Mn and Sn atoms in the SnTe-based solid solution, and the minor phases MnTe2 and MnTe enhance the phonon scattering and thus reduce the thermal conductivity.As a result, the figure of merit ZT of the (Sn0.8Pb0.2)1-xMnxTe composites can be enhanced with proper Mn substitution.The maximum ZT of 0.65 was obtained in the sample (Sn0.8Pb0.2)0.88Mn0.12Te at 723 K, which is higher than 0.29 of its parent alloy Sn0.8Pb0.2Te.
A.Functional alloys B.Thermoelectric properties C.Reaction synthesis
杨林 李均钦 逯正旺 李煜 刘福生 敖伟琴
深圳大学材料学院,深圳市特种功能材料重点实验室,深圳,518060
国内会议
桂林
英文
373-376
2015-11-03（万方平台首次上网日期，不代表论文的发表时间）