节点文献

R_yM_xCo_4-xSb₁₂化合物的晶格热导率

Lattice thermal conductivity of R_yM_xCo_4-xSb（12）

推荐 CAJ下载
PDF下载
不支持迅雷等下载工具，请取消加速工具后下载。

【Author】 Tang Xin-Feng 1) Chen Li-Dong 2) Wang Jun 1) Luo Pai-Feng 1) Zhang Qing-Jie 1) Goto T. 3) Hirai T. 3) Yuan Run-Zhang 1) 1)(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology, Wuhan 430070, China) 2)(State Key Laboratory of High Performance Ceramics and Superfine Structure,Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China) 3)(Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan)

【机构】武汉理工大学材料复合新技术国家重点实验室；上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室；日本东北大学金属材料研究所；武汉理工大学材料复合新技术国家重点实验室武汉430070；上海200050；武汉430070；仙台980-8577；武汉430070；

【摘要】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 .更多还原

【Abstract】 In this paper, the effects of filling atoms with different ionic radii of Ba, Ce, Y and different substituting atoms Fe, Ni on the lattice thermal conductivity of filled R yM xCo 4-xSb 12 are systematically investigated. The results show that the lattice thermal conductivity decreases significantly when Ba, Ce, Y atoms filled in Sb-icosahedron voids, and the reducing range of the lattice thermal conductivity increases in the order of decreasing ionic radius of Ba, Ce and Y. The lowest lattice thermal conductivity and strongest rattling actions of filling atoms to the scattering of phonons are gained when the Sb-icosahedron voids are partly filled. The lattice thermal conductivity of R yM xCo 4-xSb 12 decreases greatly by substituting Fe or Ni for Co, and the substituting atoms Ni are more effective than Fe.更多还原