Effect of Ba Filling Fraction on Thermoelectric Properties of p-type BayFe1.6Co2.4Sb12

• 作 者: TANG Xin-feng CHEN Li-dong ZHA
• 机 构: Wuhan,Shanghai Institute of Ceramics,Tohoku
• 出 处: 武汉理工大学学报英
• 发表日期: 2004年期
• 关键词: filled skutterudite compound filling fraction thermoelectric properties
• 基金项目: Grant-in-Aid for Encouragement of Young Scientists (A);the Research Foundation for Materials Science,Japan

Effects of Ba filling fraction on the thermoelectric properties of p-type filled skutterudite compounds BayFe1.6Co2.4Sb12(y=0-0.63) were investigated.BayFe1.6Co2.4Sb12 showed p-type conduction.The hall coefficient (RH) and seebeck coefficient(α) increased with increasing Ba filling fraction.But hole concentration (p) and electrical conductivity (σ) decreased.While Ba filling fraction was about 0.4,the lattice thermal conductivity (κL) reached the minimum value.The results show that effect of Ba rattling on phonon scattering is the strongest as Sb-icosahedron partial voids are filled by Ba.A maximum dimensionless thermoelectric figure of merit (ZT) value of 0.7 was obtained for Ba0.38Fe1.6Co2.4 Sb12 at 750K.