锰硅化合物的制备及塞贝克效应

Preparation of Mn-Si compound and its seebeck effect

过渡金属高锰硅化合物MnSi1.7作为半导体和难熔金属硅化物,具有热电应用的前景.尽管对Mn-Si1.7热电材料的研究已进行多年,但若要实现商业化应用,在制备和性能优化等方面还有很多问题需要解决.本文利用高温烧结的方法,在氮气氛保护下成功地制备出了锰硅块材化合物,研究了样品中所含的相结构及其所占比例(特别是MnSi1.7相)与烧结温度、保温时间的关系及它们对热电性能的影响.实验发现,Mn-Si1.7相所占的比例随着烧结温度的升高和保温时间的增加而增加,但材料的塞贝克系数在增大到某一饱和值后就不再增加了.

The higher manganese silicide MnSi1.7, a refractory transition metal semiconductor, has promising application as thermoelectric conversion element in higher temperature atmospheres. Although many investigations have been made, there are still a lot of problems on the preparation, characterization and optimization of MnSi1. 7 thermoelectric materials. In this work, Mn -Si bulk materials were sintered at high temperature in nitrogen atmosphere. The effect of sintered temperature and dwell time on the formation of MnSi1.7 phase was studied. The Seebeck coefficient was dependent on the content of MnSi1.7 phase and then reached a saturated value.