Thermoelectric Properties of Scaled-Up Double-Filled (Ba,Yb)yCo4Sb12 Skutterudites
Abstract: It usually needs about two grams thermoelectric materials to study their performance, while more are needed to develop and apply their devices. To obtain high performance scaled up barium and ytterbium filled skutterudites, we scaled up (Ba,Yb)yCo4Sb12 (y = 0.1, 0.12, 0.15) skutterudites by melting, quenching, annealing and spark plasma sintering, and studied the effects of the added amount of barium and ytterbium on the phase composition, filling fraction of barium and ytter- bium and thermoelectric properties of the materials. Results show that the scaled up (Ba,Yb)yCo4Sb12 materials consist of mainly skutterudite phase and trace amount of YbSb phase. With the added amount of barium and ytterbium increasing, the real filling fraction of barium and ytterbium increases, the resistivity and the absolute Seebeck coefficient of the skutterudits decreases and the lattice thermal conductivity of the materials drops sharply. The maximum ZT for the (Ba,Yb)yCo4Sb12 material reaches 1.31 at 850 K, close to the highest value reported.
文章引用: 宋海东 , 包晔峰 , 李小亚 (2015) 放量制备Ba、Yb填充方钴矿(Ba,Yb)yCo4Sb12的热电性能。 凝聚态物理学进展， 4， 10-17. doi: 10.12677/CMP.2015.41002
 Nolas, G.S., Morelli, D.T. and Tritt Terry, M. (1999) Skutterudites: A phonon-glass-electron crystal approach to ad-vanced thermoelectric energy conversion applications. Annual Reviews, 29, 89-116.
 Shi, X., Zhang, W., Chen, L.D., et al. (2005) Filling fraction limit for intrinsic voids in crystals: doping in skutterudites. Physical Review Letters, 18, Article ID: 185503.
 Feldman, J.L., Dai, P.C., Enck, T., et al. (2006) Lattice vibrations in La(Ce)Fe4Sb12 and CoSb3: Inelastic neutron scattering and theory. Physical Review B, 1, Article ID: 014306.
 Bai, S.Q., Shi, X. and Chen, L.D. (2010) Lattice thermal transport in BaxREyCo4Sb12 (RE=Ce, Yb, and Eu) double- filled skutterudites. Applied Physics Letters, 20, Article ID: 202102.
 Li, H., Tang, X.F., Zhang, Q.J., et al. (2008) Rapid preparation method of bulk nanostructure Yb0.3Co4Sb12+y compounds and improved thermoelectric performance. Applied Physics Letters, 25, Article ID: 252109.
 Shi, X., Kong, H., Li, C.P., et al. (2008) Low thermal conductivity and high thermoelectric figure of merit in n-type BaxYbyCo4Sb12 double-filled skutterudites. Applied Physics Letters, 18, Article ID: 182101.
 Shi, X., Yang, J., Salvador, J.R., et al. (2011) Multiple-filled skutterudites: high thermoelectric figure of merit through separately optimizing electrical and thermal transports. Journal of the American Chemical Society, 133, 7837-7846.
 Nolas, G.S., Kaeser, M., Littleton, I.V.R.T., et al. (2000) High figure of merit in partially filled ytterbium skutterudite materials. Applied Physics Letters, 12, 1855-1857.
 Sedat, B. and Strirad, U. (2014) Enhanced thermoelectric performance of optimized Ba, Yb filled and Fe substituted skutterudite compounds. Journal of Alloys and Compounds, 585, 168-172.
 Wu, T., Bai, S.Q., Shi, X., et al. (2013) Enhanced thermoelectric properties of BaxEuyCo4Sb12 with very high filling fraction. Journal of Inorganic Materials, 2, 224-228.
 Peng, J.Y., He, J., Su, Z., et al. (2009) High temperature thermoelectric properties of double-filled InxYbyCo4Sb12 skutterudites. Journal of Applied Physics, 8, Article ID: 084907.
 Zhao, W.Y., Dong, C.L., Wei, P., et al. (2007) Synthesis and high temperature transport properties of barium and in- dium double-filled skutterudites BaxInyCo4Sb12-z. Journal of Applied Physics, 11, Article ID: 113708.
 Bai, S.Q., Pei, Y.Z., Chen, L.D., et al. (2009) Enhanced thermoelectric performance of dual-element-filled skutteru- dites BaxCeyCo4Sb12. Acta Materialia, 57, 3135-3139.