用熔融退火法制备了镧填充方钴矿(LaxFe3CoSb12)多晶热电材料.用背散射方法测定了不同掺镧量晶体的拉曼光谱.我们认为晶格孔隙中镧原子的振颤运动产生了有效的声子散射并使拉曼谱线加宽.随着镧含量的增加,镧原子振颤自由度降低,谱线的加宽程度减少.
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