Fe置换CoSb_3基热电材料的原位反应合成及电性能  

Electrical properties of Fe substituted CoSb_3 based thermoelectric compounds synthesized by in-situ SPS

作　　者：张忻[1] 张久兴[1] 路清梅[1] 刘燕琴[1] 

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100022

出　　处：《中国有色金属学报》2008年第5期856-861,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50271001);北京市教委科技发展重点资助项目(KZ200310005001);国家发改委资助项目

摘　　要：以Co，Sb和Fe粉为原料，采用放电等离子烧结（SPS）技术在300-600℃温度范围内研究原位反应合成富Co基Skutterudite化合物FexCo4-xSB12（x=1．0）的合成条件，并对化合物的结构、微观形貌及热电性能进行研究。结果表明：在x=O～1．0范围内，300℃时开始生成少量的FexC04-xSb12：在400-600℃范围内，FexCp6-xSb12相为主晶相，并伴有极少量Sb相；化合物的品格常数随Fe含量的增加而线性增加；在600℃合成的FexCo4-xSb12化合物，当Fe含量小于0．3时，基本上以规则的颗粒和柱状晶生长，当Fe含量x大于0．3时，随着Fe含量的增加，颗粒和柱状晶减少，趋向于弯曲枝状晶生长：FexCp6-xSb12的电导率随着Fe置换量的增加而增加，Seebeck系数和功率因子的极值随着Fe置换量的增加而向高温方向移动。Co-rich skutterud/te compounds of FexCp6-xSb12 （x=0-1.0） wore prepared by in-situ spark plasma sintering（SPS） at temperature range from 300 to 600℃ with Co, Sb, Fe powders as raw materials. The synthesis condition, structures, morphologies and electrical proporties wore investigated, The results rovoal that for all sampl0s tho skutterudite phase appears at 300 ℃, and becomes the main phase with small amounts of Sb in the temperature range from 400 to 600 ℃. The lattice constants increase linearly with increasing Fe content. The FexCp6-xSb12 compounds grow as regular particles and columnar crystals at 600℃ with x≤0.3, but the quantity of both particle and columnar crystals decreases and the compounds tend to grow by incurved branch-shaped crystals with x≥0.3. The electrical conductivity increases with increasing substitution of Fe for Co sites, simultaneously the temperatures at which the highest value of Seebeck coefficient and power factor locate increase with increasing Fe content for Co-rich skutterudite compounds of FexCo4-xSb12.

关 键 词：方钴矿 置换 放电等离子烧结 原位反应 

分 类 号：TG113[金属学及工艺—物理冶金] TN304[金属学及工艺—金属学]