微波合成Mg_2Si_(1-x)Sn_x热电固溶体  

Synthesis of Mg_2Si_(1-x)Sn_x thermoelectric solid solutions by microwave irradiation

作　　者：周书才[1] 杜长坤[1] 符春林[1] 

机构地区：[1]重庆科技学院冶金与材料工程学院,重庆401331

出　　处：《粉末冶金材料科学与工程》2012年第4期475-481,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：重庆市自然科学基金资助项目(2009BB4228);重庆科技学院校内科研基金资助(CK2010Z09)

摘　　要：为了解决传统方法制备Mg2Si1-xSnx(0≤x≤1.0)固溶体过程中带来Mg的氧化和挥发等问题,引进微波低温合成法制备Mg2Si1-xSnx热电固溶体,用XRD及SEM分析手段对合成的块体的物相和形貌进行表征,并研究Mg2Si1-xSnx化合物的热电特性和在微波场中的加热特性以及合成工艺对Mg2Sil xSnx压坯制备的影响。结果表明:Mg2Si1-xSnx压坯在微波场中的加热升温曲线与Mg2Si1-xSnx压坯密度相关,随压坯密度增大,升温速率降低;XRD分析表明在微波辐射下Mg2Si1-xSnx形成了良好的固溶体;在测试温度范围内,Mg2Si1-xSnx在500 K温度下最高的ZT值达到0.26。In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Si1-xSnx（0≤xS≤1.0） solid solutions, microwave irradiation techniques have been used in preparing them as thermoelectric materials and thermoelectric properties of Mg2Sil-xSnx were studied. The heating behavior of Mg, Si and Sn fixed powder was investigated under microwave irradiation. X-ray diffraction （XRD） and SEM were also used to characterize the powders. The results suggest that the temperature-rising rate is dependent on the initial density of the compact and higher compact density provides lower heating rate while power setting are fixed. X-ray diffraction （XRD） patterns show that Mg2Si1-xSnx solid solutions have been well formed under microwave irradiation. The maximum dimensionless merit figure, ZT, of about 0.26 was obtained for Mg2Si1-xSnx at 500 K.

关 键 词：Mg2Si1-xSnx 固溶体 低温固相反应法 微波合成 

分 类 号：TM23[一般工业技术—材料科学与工程]