p型Ag_(0.5)(Pb_(8-x)Sn_x)In_(0.5)Te_(10)化合物的制备及其热电性能  

Preparation and thermoelectric properties of p-type Ag_(0.5)(Pb_(8-x)Sn_x)In_(0.5)Te_(10) compounds

作　　者：刘海君[1] 鄢永高[1] 唐新峰[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12期7309-7314,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);教育部科技创新工程重大项目培育基金(批准号:705035)资助的课题.~~

摘　　要：采用高温熔融缓冷和放电等离子烧结工艺制备了p型Ag0.5(Pb8-xSnx)In0.5Te10五元化合物.研究了Sn含量对化合物载流子传输特性及热电性能的影响规律.结果表明:在Ag0.5(Pb8-xSnx)In0.5Te10(x=2,2.5,3,3.5,4)五元化合物中,随着化合物中Sn含量的增加,载流子浓度和电导率增加,载流子迁移率几乎不变,Seebeck系数降低,材料的晶格热导率降低;样品在经过烧结之后,晶格热导率进一步降低.在700K时,Ag0.5Pb5Sn3In0.5Te10烧结样品的热电性能指数ZT值达到1.05.The single-phase p-type Ag0.5（Pb8-xSnx）In0.5Te10 compounds were prepared by melt reaction and spark plasma sintering （SPS）. Influences of Sn substitution for Pb on the carrier transport property and thermoelectric properties of the Ag0.5（Pb8-xSnx）In0.5Te10（x =2, 2.5, 3, 3.5, 4） were investigated. Results indicate that： the carrier concentration and electrical conductivity increase with the increase of Sn substitution fraction x, the carrier mobility remains stable with the increase of x, the Seebeck coefficient and lattice thermal conductivity decrease with the increasing of x. Thermal conductivity decreases further after spark plasma sintering. The dimensionless figure of merit ZT of Ag0.5 （Pb5 Sn3 ） In0.5 Te10 （after SPS） reached a high maximum value of 1.05 at 700 K.

关 键 词：Ag0.5(Pb8-xSnx)In0.5Te10 合成 载流子 热电性能 

分 类 号：O472[理学—半导体物理]