采用真空悬浮熔炼和真空退火方法制备了Fe1-xCoxSi2-0.1at%Cu热电材料.试样的微观组织中包含大量尺寸在1μm左右的小孔和一些裂纹.输运特性测量结果表明,550K时掺杂载流子的热激发达到饱和,700K以上发生本征激发现象.实验发现Co的最佳掺杂量为1at%左右,名义组成为Fe0.97Go0.03Si2-0.1at%Cu的试样的热电性能最好.
The microstructure and transport properties of the levitation-melting thermoelectric alloys Fe1-xCoxSi2-0. 1at% Cu wereexamined. Their microstructures were found to consist of many grains and crystal boundaries in a β-FeSi2 matrix. The alloyFe0.97Co0.03Si2-0.1at% Cu annealed for 24 h at 1 070K was found to have excellent transport properties. It is suggested thatdoping with 1.0at% (x = 0.03) of cobalt can significantly improve the thermoelectric properties of Fe1-x.xCoxSi2-0. 1at% Cu.
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