Ag偏离化学计量比Ag_(1-x)Pb_(18)SbTe_(20)材料的热电传输性能  

Thermoelectric properties of nonstoichiometric Ag_(1- x)Pb_(18)SbTe_(20) materials

作　　者：鄢永高[1] 唐新峰[1] 刘海君[1] 尹玲玲[1] 张清杰[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《物理学报》2007年第6期3473-3478,共6页Acta Physica Sinica

基　　金：国家自然科学基金重大国际合作项目(批准号:50310353);高等学校科技创新工程重大项目培育资金项目(批准号:705035)资助的课题~~

摘　　要：采用熔融-淬火-放电等离子体烧结制备了Ag偏离化学计量比Ag1-xPb18SbTe20(x=0,0.25,0.50,0.75)样品,研究了Ag含量对样品热电传输性能的影响.结果表明,随Ag含量降低,样品中出现少量第二相Sb2Te3,样品载流子浓度增加到5×1018cm-3后不再增加.样品载流子迁移率随Ag含量降低先降低后增加,随着温度增加,载流子散射机理由电离杂质散射转变为声学波散射.随Ag含量降低,样品电导率增加而Seebeck系数降低,热导率增加.Ag1-x Pb18 SbTe20 （x = 0,0.25,0.5, 0. 75） samples were prepared by melt-quench-spark plasma sintering （ SPS）. As the Ag content decreased, a second phase Sb2 Tea occurred in samples and the carrier concentration increased to 5 × 10^18 cm^-3 and then ceased to increase as Ag content decreased further. The carrier mobility decreased first, and then increased, as the Ag content decreased. As temperature increased, the carrier scattering mechanism shifted gradually from ionized impurity scattering to acoustic phonon scattering. As the Ag content decreased, the electric conductivity increased while the Seebeck coefficient decreased, and the thermal conductivity show an increasing trend.

关 键 词：热电材料 AgPbmSbTem+2 SPS 散射机理 

分 类 号：TB34[一般工业技术—材料科学与工程]