摘要
为了解决传统方法制备Mg2X(X=Si、Ge、Sn)基热电材料过程中带来Mg的氧化,挥发,碳化等问题,引进低温固相反应法,成功合成了Mg2Sn粉体,用DTA、XRD、SEM、EDS等分析手段对合成的粉体物相和形貌进行了表征,并系统研究了合成工艺对粉体制备的影响。结果表明:通过改变升温制度可以抑制Mg氧化;调节预压力大小可以有效抑制Sn析出,控制Mg过量可以补偿Mg的挥发;本实验条件下,当Mg过量0.0025mol、预成型压力20MPa、823K下保温8h时,可以得到单相Mg2Sn热电化合物粉体。
In order to reduce the oxidizing, volatilizing and carbonizing caused by Mg element in the traditional methods for synthesizing Mg2X （X= Si, Ge, Sn）compounds, solid state reaction at low temperature was introduced, DTA, XRD, SEM, and EDS were used to characterize the powders. At the same time, the influences of parameters during the synthesis processing were discussed. The results suggest that the oxidation of Mg can be restrained by changing heating programs, the separation of Sn can be controlled by adjusting pre-pressure, the volatility of Mg can be made up by controlling excessive content of Mg. When the excessive content of Mg is about 0. 0025mol, the pre-pressure is about 20MPa, the samples is kept under 823K for 8h, high purity Mg2Sn powders can be obtained under this experimental conditions.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第10期1649-1652,共4页
Journal of Functional Materials
基金
国家重点基础研究发展计划资助项目(2007CB607501)
关键词
Mg2Sn
热电材料
低温固相反应法
Mg2Sn
thermoelectric materials
solid state reaction method
