The Effect of Co and Ni Doping on the Thermoelectric Properties of Sintered β-FeSi2
The Effect of Co and Ni Doping on the Thermoelectric Properties of Sintered β-FeSi2
复制标题
Co、Ni掺杂对烧结β-FeSi2热电性能的影响
DOI：
10.2497/jjspm.41.560
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
K. Majima
中科院分区：
文献类型：
--
作者：
H. Nagai;Itoshi Maeda;S. Katsuyama;K. Majima
采用机械合金化10 h、1173 K热压30 min的方法制备了Co、Ni掺杂的β-FeSi 2烧结体（Fe 1-x-yCoxNiySi 2，x=0-0.03，y=0-0.04）。通过X射线衍射分析、电阻率和热电功率的测量，研究了Co和Ni掺杂对β-FeSi_2结构和热电性能的影响。得到的结果总结如下：1）随着Co和Ni掺杂量的增加，电阻率下降，但Co掺杂的电阻率下降幅度大于Ni掺杂的。这是由于Co在β-FeSi 2中的溶解度比Ni大。2）所有掺杂Co和Ni的烧结β-FeSi 2压块都是n型半导体。热电功率随Co、Ni掺杂量的增加而增加，但过掺杂会导致热电功率的降低。在Co：x=0.01和Ni：y= 0.01的掺杂下获得最大热电功率。3）Co掺杂比Ni掺杂更有效地提高功率因数，但少量Ni掺杂Co进一步提高功率因数。通过同时掺杂Co：x=0.03和Ni：y-0.01获得最大功率因数。
The sintered β-FeSi2 compacts doped with Co and Ni(Fe1-x-yCoxNiySi2, x=0-0.03, y=0-0.04) were prepared by mechanical alloying for 10h and hot-pressing for 30min at 1173K. The effects of Co and Ni doping on the structure and thermoelectric properties of β-FeSi2 have been studied by X-ray diffraction analysis and measurements of electrical resistivity and thermoelectric power. The results obtained are summarized as follows:1) The electrical resistivity decreased with increasing Co and Ni doping, but the decreasing ratio in resistivity was larger in Co doping than in Ni doping. This is due to the larger solubility of Co than that of Ni in β-FeSi2.2) All of the sintered β-FeSi2 compacts doped with Co and Ni were n-type semiconductors. The thermoelectric power increased with increasing Co and Ni doping, but over doping caused decreasing of thermoelectric power. Maximum thermoelectric power was obtained by doping with Co:x=0.01 and Ni:y=0.01.3) Co doping was more effective for increasing power factor than Ni doping, but small amount of Ni doping with Co further increased power factor. Maximum power factor was obtained by simultaneous doping with Co:x=0.03 and Ni:y-0.01.