((1. 浙江工业大学 化学工程与材料学院，杭州 310014；2. 宁波工程学院 机械工程学院，宁波 315016；3. 中国矿业大学 材料科学与工程学院，徐州 221008))
摘 要: 采用真空熔炼/放电等离子烧结(SPS)方法制备P型Zn4−xCuxSb3−xBix(x=0~0.8)材料，研究该合金的组织结构和热电性能。结果表明，x＜0.2时，Zn4−xCuxSb3−xBix材料的Seebeck系数随x值增大而增大，当x=0.2时达到最大值；而当x＞0.2后，Seebeck系数又随x值增大而下降。在x=0.2和487 K的条件下，Seebeck系数达到最大值，为249.2 mV/K。合金的电导率随Cu和Bi含量增加而增大。借助Zn4-xCuxSb3的热扩散系数，计算得到材料的热导率随x值增大而增大；在574 K，x=0.4时，Zn4−xCuxSb3−xBix合金的最大热电优值(ZT)为0.53，比同温度下b-Zn4Sb3合金的ZT值大0.07。
关键字: Zn-Cu-Sb-Bi合金；共掺杂；热电性能；放电等离子烧结
（(1. College of Chemical Engineering and Materials Science, Zhejiang University of Technology,Hangzhou 310014, China;2. School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315016, China;3. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221008, China)）
Abstract:P-type Zn4−xCuxSb3−xBix (x=0−0.8) alloys were prepared through vacuum melting and spark plasma sintering, and their structures were characterized. The results show that the Seebeck coefficient () increases with molar fraction (x) up to x=0.2 and then decreases, the electrical conductivity (σ) increases with increasing molar fraction x value. Considering the same fabrication technology of Zn4−xCuxSb3−xBix and Zn4−xCuxSb3 with the same x, the measured thermal diffusivities of Zn4−xCuxSb3 were used to calculate the thermal conductivities of Zn4−xCuxSb3−xBix. A relative enhancement of ZT is attained for Zn3.6Cu0.4Sb3.6Bi0.4, whose ZT is 0.53 at 574 K, about 0.07 higher than that of Zn4Sb3 at the same temperature.
Key words: Zn-Cu-Sb-Bi alloys; co-doping; thermoelectric properties; spark plasma sintering (SPS)
