Effect of rapid solidification on the synthesis and thermoelectric properties of Yb-filled Co4Sb12 skutterudite
Effect of rapid solidification on the synthesis and thermoelectric properties of Yb-filled Co4Sb12 skutterudite
复制标题
DOI：
10.1016/j.jallcom.2019.04.337
复制
发表时间：
2019-08-05
影响因子：
6.2
通讯作者：
Castellero, A.
中科院分区：
文献类型：
--
作者：
Aversano, F.;Branz, S.;Castellero, A.
在这项工作中，不同的工艺路线上的Co4Sb12相和Yb填充的方钴矿cage，以及热电behaviores.As制备的形成动力学的效果缓慢冷却的锭和快速凝固的带显示存在多个相，作为一个复杂的凝固路径的结果，其特征在于由两个periodic反应。随着凝固速率的提高，晶粒细化得到促进。退火快速凝固带诱导更快的溶解的Yb由于晶界扩散率增加。由于这个原因，快速凝固可以被认为是一个有前途的中间步骤，以减少总的处理时间的方钴矿。从缓慢冷却的锭和快速凝固带获得的粉末的烧结导致形成具有不同密度的块状样品，这取决于初始粉末的粒度分布。Yb含量对热电性能的影响进行了严格的分析，考虑到文献和这项工作的数据。(C)2019 Elsevier B.V.版权所有。
In this work the effect of different processing routes on the kinetics of formation of Co4Sb12 phase and Yb filling in the skutterudite cage, as well as thermoelectric behaviour was evaluated.As prepared slowly cooled ingot and rapidly solidified ribbons show the presence of multiple phases, as a consequence of the complex solidification path characterized by two peritectic reactions. As solidification rate increases, grain refinement is promoted. Annealing of rapidly solidified ribbons induces a faster solubilisation of Yb due to increased grain boundary diffusivity. For this reason, rapid solidification can be considered a promising intermediate step for lowering the total processing time of skutterudites.Sintering of powders obtained from the slowly cooled ingot and rapidly solidified ribbons leads to the formation of massive samples with different densities, depending on the particle size distributions of the starting powders. The effect of Yb content on the thermoelectric properties was critically analysed, considering both data from the literature and this work. (C) 2019 Elsevier B.V. All rights reserved.