Investigation of skutterudite MgyCo4Sb12: High pressure synthesis and thermoelectric properties
Investigation of skutterudite MgyCo4Sb12: High pressure synthesis and thermoelectric properties
复制标题
DOI：
10.1063/1.4795599
复制
发表时间：
2013-03
影响因子：
3.2
通讯作者：
Jianqing Yang;Long Zhang;Yadi Liu;Chen Chen-Chen;Jianghua Li;D. Yu;Julong He;Zhongyuan Liu;Yongjun Tian;Bo Xu
中科院分区：
文献类型：
--
作者：
Jianqing Yang;Long Zhang;Yadi Liu;Chen Chen-Chen;Jianghua Li;D. Yu;Julong He;Zhongyuan Liu;Yongjun Tian;Bo Xu
从理论上研究了加压下Mg原子对CoSb 3晶格空位的填充行为，揭示了常压下不可接近的Mg填充CoSb 3在高压下可以稳定。受此启发，我们采用高压合成法合成了Mg填充的CoSb 3。合成样品显示出方钴矿结构的Im 3 <$对称性，Mg填充分数高达0.4。热电测量表明，镁填充后的热导率显着降低和有限的功率因数的提高，这可能与镁的相对较高的电负性。Mg0.4Co4Sb12在620 K时的ZT最高，为0.33。与传统的固相反应法相比，高压合成法可以大大缩短反应时间，增加可填充元件的数量，为热电材料的制备提供了一条有效的途径。
The filling behavior of Mg atoms into CoSb3 lattice voids under pressure was investigated theoretically, revealing ambient-pressure-inaccessible Mg-filled CoSb3 can be stabilized under high pressure. Inspired by this result, we synthesized Mg-filled CoSb3 using high pressure synthesis. The synthetic samples show Im3¯ symmetry of skutterudite structure, with Mg filling fraction as high as 0.4. Thermoelectric measurements indicated a significant reduction in thermal conductivity and a limited enhancement of power factor after Mg filling, which may connect with the relatively high electronegativity of Mg. The highest ZT of 0.33 was achieved in Mg0.4Co4Sb12 at 620 K. Compared with the traditional solid state reaction method, high pressure synthesis can substantially shorten the reaction duration and extend fillable elements, thus providing us an effective pathway for thermoelectric materials fabrication.