Isotropic Mg3Sb2 compound prepared by solid-state reaction and ball milling combined with spark plasma sintering
Isotropic Mg3Sb2 compound prepared by solid-state reaction and ball milling combined with spark plasma sintering
复制标题
固相反应球磨结合放电等离子烧结制备各向同性Mg3Sb2化合物
DOI：
10.1007/s10853-018-2127-5
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发表时间：
2018
影响因子：
4.5
通讯作者：
Tang Xinfeng
中科院分区：
文献类型：
--
作者：
Lv Feng;Zhang Qiang;Fan Wenhao;Yang Xiaomeng;Fan Jianfeng;Zhang Hua;Chen Shaoping;Wang Wenxian;Tang Xinfeng
分别采用低温固相反应法（SSR）和球磨法（BM）制备了Mg3 Sb 2化合物，并采用放电等离子烧结法（SPS）制备了Mg3 Sb 2化合物。在SPS过程中可能的烧结压力诱导取向的影响进行了研究的微观结构和热电输运性能。结果表明，BM工艺比单纯SSR工艺造成更严重的Mg损失，导致SPS凝固后的产品中存在明显的Sb相。与此相反，SSR和SPS技术相结合，很容易获得单相的Mg3 Sb 2。此外，这些BM SPS和SSR-SPS样品具有相似的显微结构，以及相同的电和热输运性能平行或垂直于烧结压力的方向。研究表明，在本实验条件下，与BM法相比，SSR法既能控制Mg3 Sb 2化合物的成分，又能消除Mg3 Sb 2化合物中的取向。研究结果对该材料的制备及热电模块和器件的应用具有重要意义。
Mg3Sb2compounds were synthesized via low-temperature solid-state reaction (SSR) and ball milling (BM), respectively, followed by spark plasma sintering (SPS) process. The effects of possible sintering pressure-induced orientation in the SPS process have been investigated in terms of the microstructure and thermoelectric transport properties. The results indicate that BM technique causes more severe Mg loss than pure SSR method, leading to distinct Sb phase existing in the product after SPS consolidation process. On the contrary, a single phase of Mg3Sb2is easily obtained with the combination of SSR and SPS techniques. Besides, these BM–SPS and SSR–SPS samples exhibit the similar microstructure as well as the same electrical and thermal transport properties parallel or perpendicular to the direction of sintering pressure. The study suggests that SSR method embodies the advantages of both the composition control and the orientation elimination in Mg3Sb2compound as compared to BM method with the specific parameters in the current work. This investigation is quite favorable for this material fabrication and the future application of thermoelectric modules and devices.