Submicron features in higher manganese silicide
Submicron features in higher manganese silicide
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DOI：
10.1155/2013/701268
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发表时间：
2013
影响因子：
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通讯作者：
Y. Sadia;Mor Elegrably;O. Ben-Nun;Y. Marciano;Y. Gelbstein
中科院分区：
文献类型：
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作者：
Y. Sadia;Mor Elegrably;O. Ben-Nun;Y. Marciano;Y. Gelbstein
世界能源危机增加了对替代能源的需求，因此是研究的前沿课题之一。减少能源消耗的一种方法是热电。热电效应能够将热能直接转换为电能。高硅化锰（HMS，MnSi 1.75）是一种在热电领域有应用前景的材料。元素的丰富性和低成本，加上良好的热电性能和高温下的高机械和化学稳定性，使其对热电应用非常有吸引力。最近的研究表明，富硅HMS具有改善的热电性能。其中最有趣的是导热性的不寻常的降低。在目前的研究中，透射（TEM）和扫描（SEM）电子显微镜以及X-射线衍射方法被应用于调查的管理机制，导致非常低的导热系数值的富硅HMS组合物，电弧熔化和热压程序。在本文中，它表明，有一个亚微米位错壁，堆垛层错，硅和HMS沉淀物内彼此明显的矩阵中，高温（0.9 Tm）热压一个小时后，存在。这些不仅是观察到的低热导率值的原因，而且还表明了创建复杂纳米结构的能力，这些结构将在生产过程中并可能在应用过程中持续存在。
The world energy crisis had increased the demand for alternative energy sources and as such is one of the topics at the forefront of research. One way for reducing energy consumption is by thermoelectricity. Thermoelectric effects enable direct conversion of thermal into electrical energy. Higher manganese silicide (HMS, MnSi1.75) is one of the promising materials for applications in the field of thermoelectricity. The abundance and low cost of the elements, combined with good thermoelectric properties and high mechanical and chemical stability at high temperatures, make it very attractive for thermoelectric applications. Recent studies have shown that Si-rich HMS has improved thermoelectric properties. The most interesting of which is the unusual reduction in thermal conductivity. In the current research, transmission (TEM) and scanning (SEM) electron microscopy as well as X-ray diffraction methods were applied for investigation of the govern mechanisms resulting in very low thermal conductivity values of an Si-rich HMS composition, following arc melting and hot-pressing procedures. In this paper, it is shown that there is a presence of submicron dislocations walls, stacking faults, and silicon and HMS precipitates inside each other apparent in the matrix, following a high temperature (0.9 Tm) hot pressing for an hour. These are not just responsible for the low thermal conductivity values observed but also indicate the ability to create complicate nano-structures that will last during the production process and possibly during the application.