【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,挥发等问题,引进微波低温固相反应法,成功合成了Mg2Si粉体,用XRD分析手段对合成的粉体物相进行了表征,并系统研究了合成工艺对粉体制备的影响。结果表明:通过采用合适的加热工艺制度可以抑制Mg氧化;控制Mg过量可以补偿Mg的挥发;本实验条件下,当Mg过量0.0125mol、加热功率在2.5kW(853K)下保温30min时,可以得到单相Mg2Si热电化合物粉体。更多还原

【Abstract】 In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2X(X = Si,Ge,Sn) compounds,solid state phase reaction at low temperature was introduced by microwave field.XRD was 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 rest rained by changing microwave heating programs,the volatility of Mg can be made up by controlling excessive content of Mg.When the excessive content of Mg is about 0.0125mol,the samples is kept under 2.5kW(853K) for 30min,high purity Mg2Si powders can be obtained under this experimental conditions.更多还原