(北京工業(yè)大學(xué) 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、 Fe及Ce為起始原料， 采用放電等離子燒結(jié)(SPS)技術(shù)原位反應(yīng)合成了填充式Skutterudite化合物CeyFe1.0Co3.0Sb12，并研究了該化合物的合成條件及熱電性能。 實(shí)驗(yàn)結(jié)果表明： 當(dāng)y為0~0.30時(shí)，用放電等離子燒結(jié)法在573 K開始生成CeyFe1.0Co3.0Sb12，且在673~873 K時(shí)， CeyFe1.0Co3.0Sb12化合物為主晶相，并伴有極少量的FeSb2和Sb相。 晶格常數(shù)和Seebeck系數(shù)隨Ce填充分?jǐn)?shù)的增加而呈線性增加， 電導(dǎo)率和熱導(dǎo)率隨Ce填充分?jǐn)?shù)的增加而降低。 CeyFe1.0Co3.0Sb12化合物表現(xiàn)為P型傳導(dǎo)， CeyFe1.0Co3.0Sb12化合物中Ce的填充分?jǐn)?shù)y為0.30時(shí)， Ce0.30Fe1.0Co3.0Sb12化合物具有較高的熱電性能，其中在773 K時(shí)具有最大的熱電優(yōu)值(ZT值)0.45。
關(guān)鍵字: 方鈷礦; 放電等離子燒結(jié); 電導(dǎo)率; 熱導(dǎo)率; Seebeck系數(shù)
（The key Laboratory of Advanced Functional Materials，
Ministry of Education，Beijing University of Technology, Beijing 100022, China）
Abstract: The filled skutterudite CeyFe1.0Co3.0Sb12 was prepared by in-situ spark plasma sintering(SPS) technology using Co, Sb, Fe and Ce powder as materials, and the synthesis condition and thermoelectric properties were studied. The results show that the skutterudite phase appears at 573 K and becomes main phase with a small amounts of other phases such as FeSb2 and Sb, when temperature range is 673-873 K and 0<y≤0.30. All the Ce-filling compounds of CeyFe1.0Co3.0Sb12 is P-type conduction, the lattice constant and Seebeck coefficient increase with the Ce-filling increasing, while the electrical conductivity and thermal conductivity decrease. The Ce0.30Fe1.0Co3.0Sb12 compound has higher thermoelectric property when y is 0.30, the maximum value of the dimensionless figure of merit(ZT) is 0.45 at 773 K.
Key words: skutterudite; spark plasma sintering; electrical conductivity; thermal conductivity; seebeck coefficient
