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本文利用传统固相烧结法制备了Cd1?xSrxO(x=0,0.01,0.03,0.05)多晶块体并研究了Sr掺杂对Cd O高温热电性能的影响.在Cd O中掺杂Sr O会使样品的载流子浓度降低,导致其电阻率和塞贝克系数绝对值增大.同时,Sr的引入抑制了Cd O多晶的晶粒生长,导致其尺寸减小、晶界增多.随着Sr掺杂浓度的提高,样品的电子热导率和声子热导率均呈现出下降趋势,使得总热导率大幅度降低,Cd0.95Sr0.05O样品的热导率在1000 K时仅为1.71 W m?1 K?1,低于多数氧化物热电材料.由于总热导率的降低,所有掺杂样品的热电性能均得到了提升,其中,Cd0.97Sr0.03O多晶样品在1000 K时的ZT值达到了0.40,比非掺杂Cd O多晶样品提高了25%,可与目前报道的最好的n型氧化物热电材料相比拟.
In this paper, Cd1? XSrxO (x = 0,0.01,0.03,0.05) polycrystalline lumps were prepared by solid state sintering method and the effect of Sr doping on the thermoelectric properties of CdO was investigated. The carrier concentration will decrease, leading to the increase of absolute value of resistivity and Seebeck coefficient.At the same time, the introduction of Sr inhibits the grain growth of CdO polycrystalline, resulting in the decrease of its size and the increase of grain boundary. With the increase of Sr doping concentration, both the electronic thermal conductivity and the phonon thermal conductivity of the samples show a downward trend, so that the total thermal conductivity is greatly reduced. The thermal conductivity of Cd0.95Sr0.05O samples at 1000 K 1.71 W m -1 K -1, which is lower than most oxide thermoelectric materials.The thermoelectric properties of all the doped samples have been improved due to the decrease of the total thermal conductivity, among which, the Cd0.97Sr0.03O polycrystalline sample has a surface area of 1000 The ZT value reaches 0.40 at K, which is 25% higher than that of non-doped CdO polycrystalline samples, which can be compared with the best reported n-type oxide thermoelectric materials.