铋-二氧化硅纳米复合材料的热电性能

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI:10.1109/ICT.1999.843412

F. Brochin, B. Lenoir, X. Devaux, H. Scherrer

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引用次数: 3

摘要

采用粉末冶金法制备了块体铋-二氧化硅纳米复合材料，研究了二氧化硅夹杂物对铋基材料输运性能的影响。采用电弧等离子体法制备了Bi-SiO/ sub2 /超细粉体。透射电镜调查显示，每个铋颗粒周围存在纳米二氧化硅壳。在接近铋熔点的温度下对纳米复合粉体进行冷压烧结。在5 ~ 300 K范围内测量了电阻率，在65 ~ 300 K范围内测量了热电功率、导热系数和热电优值。比较了纯铋单晶和多晶与纳米复合材料的输运特性。

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Thermoelectric properties of bismuth-silica nanocomposites

Bulk bismuth-silica nanocomposites have been prepared via powder metallurgy to study the influence of silica inclusions on the transport properties of Bi-based materials. Bi-SiO/sub 2/ ultrafine powders were produced by an arc-plasma processing. TEM investigations revealed the presence of a nanometric silica shell around each Bi grain. The nanocomposite powders were cold pressed and sintered close to the melting temperature of bismuth. The electrical resistivity was measured from 5 K to 300 K, the thermoelectric power, the thermal conductivity and the thermoelectric figure of merit were measured from 65 K to 300 K. The transport properties of pure single crystalline and polycrystalline bismuth are compared to those of nanocomposite materials.

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Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)

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