采用快速凝固方法制备了FeSi2基热电材料Fe 0.92 Mn0.08 Six(x=1.9、2.0、2.1、2.3、2.5)粉末,在高真空下采用热压法制备了块状热电材料.X射线衍射分析表明,所有试样热压后均达到了相平衡,而且x=1.9和2.0的试样热压后就完成了βFeSi2相转变,随着Si含量的增加,β相逐渐减少,α相逐渐增多.热压试样经800℃退火20h后,完全转变为β半导体相.热压退火试样的致密度为93%～98%.研究发现,弥散分布的过量Si较少时,有利于提高βFeSi2基热电材料的性能.名义成份为Fe0.92Mn0.08Si2.1的试样在高温区的无量纲优值最大,650℃时达到0.18.但是,当Si过量较多时,试样的热导率明显增加,显著降低了试样的优值.
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