中文摘要：

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纽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FeSb。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CoSb2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。

英文摘要：

Starting from element La, Fe and Sb powders, nominal LaxFe4 Sb12 （x= 0.5, 1.0, 1.5） filled Skutterudite was prepared by mechanical alloying （MA）, hot pressing （HP） and annealing, the effect of the La filling fraction on phase formation and thermoelectric properties of the hot pressed and the annealed samples was stud- ied in this paper. It was found that quite a lot of Sb and FeSb~ peaks manifest in the XRD patterns of x=0.5 and x= 1.0. Increasing the La addition to x=1.5, almost single phase filled skutterudite is achieved and only minute traces of Sb and FeSb2 remain in the XRD pattern. The secondary phases such as Sb and FeSb2 almost eliminated in the XRD pattern when the hot pressed Lal.~Fe4Sbl~ sample was annealed at 650℃ for 48h. Over the temperature range of 300-750K, the Seebeck coefficient and the electrical resistivity of the samples increase with increasing of both La addition and temperature. The thermal conductivity is greatly decreased in comparison with that of unfilled CoSb2 skutterudite. A maximum ZT of 0.51 was obtained for the annealed La1.5 Fe4Sb12 sample at 750K.