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采用机械合金化制备了n型(Bi1-xAgx)2(Te1-ySey)3合金粉体,对其进行XRD分析表明Bi,Te,Ag,Se单质粉末,经2h球磨后实现了合金化;SEM分析表明随着机械合金化时间延长粉体颗粒变得均匀、细小,颗粒尺寸在微米至亚微米数量级.采用放电等离子烧结制备了块体样品,研究了合金成分和球磨时间对热电性能的影响.结果表明材料的热电性能与掺杂元素有密切关系,Ag有利于提高功率因子和降低晶格热导率,球磨10h的(Bi0.99Ag0.01)2(Te0.96Se0.04)3合金粉末的烧结块体具有最大的功率因子和最低的晶格热导率,并在323K取得最高ZT值0.52.
The n-type (Bi1-xAgx) 2 (Te1-ySey) 3 alloy powders were prepared by mechanical alloying. XRD analysis showed that the alloy powders were single-phase powders of Bi, Te, Ag and Se. The results show that the powder particles become uniform and fine with the time of mechanical alloying, the particle size is on the order of micrometer to submicron.The bulk samples were prepared by spark plasma sintering and the effects of alloy composition and milling time on the thermoelectric properties were investigated. The results show that the thermoelectric properties of the material are closely related to the doping elements, Ag is conducive to improving the power factor and reducing the lattice thermal conductivity, the (Bi0.99Ag0.01) 2 (Te0.96Se0.04) 3 alloy powder The sintered mass has the largest power factor and the lowest lattice thermal conductivity and achieves a maximum ZT value of 0.52 at 323K.