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系统地研究了离子半径不同的Ba,Ce ,Y作为填充原子及Fe ,Ni作为置换原子对填充化合物RyMxCo4 -xSb1 2 晶格热导率的影响规律 .结果表明 :在skutterudite结构的Sb组成的 2 0面体空洞中 ,Ba ,Ce,Y的填充原子能显著降低其晶格热导率 ,且晶格热导率降低幅度按Ba ,Ce ,Y离子半径减小的顺序而增大 .Sb组成的 2 0面体空洞部分被Ba ,Ce填充时 ,晶格热导率最小 ,填充原子的扰动对声子的散射作用最强 .在Co位置上Fe和Ni的置换 ,能显著地降低RyMxCo4 -xSb1 2 化合物的晶格热导率 ,与Fe相比 ,Ni对晶格热导率的影响更强 .
The effects of Ba, Ce, Y as filler atoms and Fe and Ni as substitutional atoms on the lattice thermal conductivity of the filled compound RyMxCo4-xSb1 2 were investigated systematically. The results show that the Sb composition in the skutterudite structure 2 0, the Ba, Ce, Y filled atoms can significantly reduce the lattice thermal conductivity, and the decrease of lattice thermal conductivity increases in the order of decreasing Ba, Ce and Y ion radius. 0 The lattice thermal conductivity is the smallest when filled with Ba and Ce, and the strongest scattering effect by atom-filled atoms on the phonon scattering. The substitution of Fe and Ni at the Co site significantly reduces the lattice constant of the RyMxCo4-xSb1 2 compound Lattice thermal conductivity, compared with Fe, Ni thermal conductivity of the lattice stronger.