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起始原料使用La、Fe和Sb元素粉末,采用机械合金化(MA)、热压烧结(HP)及退火的方法制备了名义成分为LaxFe4Sb12(x=0.5, 1.0, 1.5)填充Skutterudite化合物热电材料,研究了不同La含量对热压样及退火样的相组成及热电性能的影响.研究结果表明,当La名义填充分数为0.5和1.0时,XRD图谱中Sb和FeSb2杂峰还比较强;但当La填充分数增加到1.5时,XRD图谱中只有少量的Sb和FeSb2杂峰;La1.5热压样经过650℃退火48h后,Sb和FeSb2杂峰基本消除;在300~750K的温度范围内,Seebeck系数和电阻率随着La填充量和测量温度的增加而增加,与未填充的CoSb3相比,热导率大大降低;热电性能研究表明,La1.5Fe4Sb12退火样在750K左右能得到最大的ZT值0.51.

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