Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO2 Coating

doi:10.3724/SP.J.1077.2010.00577

Abstract

Abstract: Single-phase Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂bulk materials were synthesized by melting and spark plasma sintering (SPS) methods. Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂nanocomposite material with nano-SiO₂coating was prepared by wet chemical coating processing. Emphases were given on the evolution of microstructure, chemical composition, and thermoelectric properties of two kinds of (Ba,In) double-atom filled skutterudite based bulk materials during periodic thermal cycling 2000 times in the range of 300-723-300 K. It was found that the thermal stability of (Ba,In) double-atom filled skutterudite was remarkably improved after nano-SiO₂ coated. The microstructure and chemical composition along the grain boundaries of single-phase Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂bulk material obviously changed, while the thermal cycling had no effect on Ba_0.3In_0.2Ni_0.05Co_3.95Sb₁₂/SiO₂nanocomposite. Thus the nano-SiO₂stabilized the grain boundary and prevented the elements diffusing and volatilizing from intra-grain. The ZT values of two kinds of materials were very close and kept unchanged at 300 K and 500 K during the thermal cycling. The ZT values of single-phase bulk materials gradually decreased at 800 K. However, the ZT values of nanocomposite mainly depended on the complex changes in thermal conductivity and increased with prolonging of quenching time, then reached 1.12 at 800 K after quenching for 1800 times, which was even higher than those of unquenched Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂/SiO₂ nanocomposite (ZT=1.08) and single-phase Ba_0.3In_0.2Co_3.95Ni_0.05Sb₁₂ bulk material(ZT=1.10) quenched for 1800 times.

Key words: thermoelectric material, SiO2 coating, filled skutterudite, thermal stability

CLC Number:

TB34

WEI Ping, DONG Chun-Lei, ZHAO Wen-Yu, ZHANG Qing-Jie. Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO₂ Coating[J]. Journal of Inorganic Materials, 2010, 25(6): 577-582.

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Enhancement of Thermal Stability of Filled Skutterudite Thermoelectric Materials through Nano-SiO₂ Coating

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