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

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/Mg2Si0.8Sn0.2(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 Mg2Si0.8Sn0.2 were studied. The field emission scanning electron microscopy shows that the nanometer-sized SiO2 particles disperse homogeneously in Mg2Si0.8Sn0.2 matrix. Among all of the samples, 1wt. % SiO2/Mg2Si0.8Sn0.2 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 Mg2Si0.8Sn0.2 can be enhanced effectively by the dispersion of nanometer-sized SiO2.