【摘要】 为了研究化学镀Zn对n型Bi₂Te_2.4Se_0.6材料的热电性能的影响及作用机制,采用化学镀法制备n型Zn/Bi₂Te_2.4Se_0.6纳米粉体,并结合放电等离子烧结烧制成块体材料,n型Zn/Bi₂Te_2.4Se_0.6热电材料的Seebeck系数（S）提升,热导率显著降低,其中0.15%Zn/Bi₂Te_2.4Se_0.6的热导率最低,在371 K达到最小值0.74 W/（m·K）,这是由于载流子浓度的降低引起电子热导减小,以及第二相和晶界增多引起声子散射造成晶格热导降低。结果表明,0.15%Zn/Bi₂Te_2.4Se_0.6的热电优值（ZT）有很大的提升,在421 K达到1.06。更多还原

【Abstract】 In order to study the effect of electroless Zn plating on the thermoelectric properties of n-type Zn/Bi₂Te_2.4Se_0.6 materials and its mechanism,n-type Zn/Bi₂Te_2.4Se_0.6 nanopowders were prepared by electroless plating,and then sintered into bulk by spark plasma sintering. The Seebeck coefficient（ S） of n-type Zn/Bi₂Te_2.4Se_0.6 thermoelectric material increases and the thermal conductivity decreases significantly,among which the thermal conductivity of 0. 15%Zn/Bi₂Te_2.4Se_0.6 reaches the minimum value of 0.74 W/（ m·K）at 371 K. This is due to the decrease of electron thermal conductivity caused by the decrease of carrier concentration,and the decrease of lattice thermal conductivity caused by phonon scattering caused by the increase of second phase and grain boundary. The results show that the thermoelectric figure of merit（ ZT） value of 0. 15%Zn/Bi₂Te_2.4Se_0.6 is 1. 06 at 421 K.更多还原