Enhanced Thermoelectric Properties of BaxEuyCo4Sb12 with Very High Filling Fraction

doi:10.3724/SP.J.1077.2012.12615

Abstract

Abstract:

Filled skutterudite is one of the most promising thermoelectric materials for power generation applications. We report the high-temperature thermoelectric properties including electrical conductivity, Seebeck coefficient, and thermal conductivity in single-phased polycrystalline dual-element-filled skutterudites Ba_xEu_yCo₄Sb₁₂(0<x<0.2, 0<y<0.3). The double-filled skutterudites are synthesized by the melting-quenching-annealing method and the bulk pellects are sintered by spark plasma sintering (SPS). High total filling fractions (x+y>40%) with very large power factor of Ba_xEu_yCo₄Sb₁₂over 60 μW/(cm•K²) at high temperature is obtained. The combination of Ba and Eu fillers inside the voids of the skutterudite structure provides a broad range of resonant phonon scattering and consequently a strong suppression in the lattice thermal conductivity is observed. The lattice thermal conductivity values for Ba_xEu_yCo₄Sb₁₂system are dramatically decreased and the lowest value is about 1.7 W/(m•K) at room temperature. Consequently, enhanced thermoelectric figure of merits (ZT) for Ba and Eu dual-element-filled CoSb₃ skutterudites are obtained at elevated temperatures, in particular ZT=1.3 at 850 K for Ba_0.19Eu_0.23Co₄Sb₁₂.

Key words: thermoelectric, filled-skutterudite, transport properties

CLC Number:

TQ174

WU Ting, BAI Sheng-Qiang, SHI Xun, CHEN Li-Dong. Enhanced Thermoelectric Properties of Ba_xEu_yCo₄Sb₁₂ with Very High Filling Fraction[J]. Journal of Inorganic Materials, 2013, 28(2): 224-228.

Figures/Tables 6

Fig. 1 Measured temperature dependence of the electrical conductivity (σ) in double-filled skutterudites

Fig. 2 Measured temperature dependence of the Seebeck coefficient (S) in double-filled skutterudites

Fig. 3 Measured temperature dependence of the Seebeck coefficient (S2σ) in double-filled skutterudites

Fig. 4 Measured temperature dependence of total thermal conductivity (κ) in double-filled skutterudites

Fig. 5 Measured temperature dependence of lattice thermal conductivity (κL) in double-filled skutterudites

Fig. 6 Measured temperature dependence of dimensionless figure of merit (ZT) in double-filled skutterudites

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Enhanced Thermoelectric Properties of Ba_xEu_yCo₄Sb₁₂ with Very High Filling Fraction

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