(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)
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~
关键字: 方钴矿；置换；放电等离子烧结；原位反应
（The Key Laboratory of Advanced Functional Materials, Ministry of Education,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China）
Abstract:Co-rich skutterudite compounds of FexCo4−xSb12 (x=0−1.0) were 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 properties were investigated. The results reveal that for all samples the 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 FexCo¬4−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.
Key words: skutterudite compounds; substitution; spark plasma sintering; in-situ SPS
