(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點(diǎn)實(shí)驗(yàn)室，北京100022)
摘 要: 以Co, Sb和Fe粉為原料，采用放電等離子燒結(jié)(SPS)技術(shù)在300~
關(guān)鍵字: 方鈷礦；置換；放電等離子燒結(jié)；原位反應(yīng)
（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
