场激活合成Mg2Si热电性能研究

Bulk Thermoelectric material Mg2Si was synthesized and compected speedy in one step by Field-activated and Pressure-assisted at 1073 K 、50MPa for 15min using Mg and Si powders as raw material. It was found that Mg2Si peak is the only clear peaks there is no residual Si or Mg peak in the XRD pattern of FAPASA sample. The content of Mg2Si was about 99.5%. The Optical value of Seebeck coefficient α and electrical conductivity σ of the FAPASA samples were 445µVK-1, 54.4Scm-1 were obtained at the temperature of 562 K and 773K respectively. the highest power factor, 4.35×10-6W/cmK2 at 600 K, was obtained from the calculation from the Seebeck coefficients and electrical conductivity of sample. Compared with other synthesize methods, the FAPASA sample can achieve a higher power factor.