物理学报2012，Vol.61Issue(4)：396-401,6.
纳米结构碲化铋合金的制备及电热输运特性
Synthesis and thermoelectric properties of nanostructured bismuth telluride alloys
摘要
Abstract
The Bi and the Te nano-powders are prepared by inert gas protected evaporation-condensation method;the n-type Bi_2Te_3 bulk materials with nano-layer and twin crystallite sub-structures are then synthesized by mechanical alloying and spark plasma sintering technique.The effects of grain size and microstructure on thermoelectric property are also systematically studied.The SEM and the TEM analyseis show that the nano-layered Bi_2Te_3 bulk materials with twin crystallite sub-structures could be fabricated by controlling the preparing procedures.The thermoelectric property result shows that the thermal conductivity is lowered compared with that of bulk material of coarse-grained starting powders.The thermal conductivity decreases from 1.80 W/mK to 1.19 W/mK at 423 K,the lattice thermal conductivity decreases from 1.16 W/mK to 0.61 W/mK at 423 K,indicating that the phonon scattering could be enhanced due to the coexistence of nano-layer and twin crystallite sub-structures,leading to reduced phonon thermal conductivity.The dimensionless figure of merit ZT reaches 0.74 at 423 K for bulk materials sintered at 693 K.关键词
碲化铋合金/尺度效应/热导率/热电性能Key words
Bi_2Te_3 alloy/size effect/thermoelectric conductivity/thermoelectric properties分类
通用工业技术引用本文复制引用
张忻,马旭颐,张飞鹏,武鹏旭,路清梅,刘燕琴,张久兴..纳米结构碲化铋合金的制备及电热输运特性[J].物理学报,2012,61(4):396-401,6.基金项目
国家自然科学基金 （）
北京市自然科学基金 （）
北京市属高校人才强教计划资助项目（批准号：PHR201 10812）资助的课题 （）
