Preparation and Thermoelectric Characteristics of SiO2/Mg2Si0.8Sn0.2 Bulk Nanocomposite

De Hua Zhang; Wen Hao Fan; Feng Zhang; Shao Ping Chen; Qing Sen Meng

doi:10.4028/www.scientific.net/AMR.415-417.47

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417Preparation and Thermoelectric Characteristics of...

Preparation and Thermoelectric Characteristics of SiO₂/Mg₂Si_0.8Sn_0.2 Bulk Nanocomposite

Abstract:

In the present study, Mg₂Si nanoparticles of high purity were successfully synthesized through low-temperature reaction by using MgH₂ and Si powders as rawmaterials. The size of Mg₂Si particles is about 50nm. The bulk nanocomposites xSiO₂/Mg₂Si_0.8Sn_0.2(x = 0, 0.1, 1 and 2wt. %) were followed by field-Activated and pressure-assisted synthesis (FAPAS). The effects of SiO₂ addition on the microstructure and thermoelectric properties of Mg₂Si_0.8Sn_0.2 were studied. The field emission scanning electron microscopy shows that the nanometer-sized SiO₂ particles disperse homogeneously in Mg₂Si_0.8Sn_0.2 matrix. Among all of the samples, 1wt. % SiO₂/Mg₂Si_0.8Sn_0.2 exhibits the best figure of merit (ZT = 0.25 at 573 K), which is 24% higher than that of the sample without SiO₂, indicating that the thermoelectric properties of Mg₂Si_0.8Sn_0.2 can be enhanced effectively by the dispersion of nanometer-sized SiO₂.

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Periodical:

Advanced Materials Research (Volumes 415-417)

Pages:

47-51

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.415-417.47

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Online since:

December 2011

Authors:

De Hua Zhang, Wen Hao Fan, Feng Zhang, Shao Ping Chen, Qing Sen Meng

Keywords:

Low-Temperature Reaction, MgH₂, Nanocomposite, SiO₂

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