采用固相反应和真空热压法,以CaSi_2、Mg、Si为原料制备Ca取代的Mg_2Si基热电材料,研究了钙取代对Mg_2Si热电性能的影响.XRD结果表明Ca取代Mg_2Si材料成相良好,测量了样品的电导率、Seebeck系数及热导率.由于Ca和Mg电负性、离子半径的不同,Ca对Mg位的替代对声子形成散射,降低了材料热导率,提高了其热电性能.
Mg_(2-x)Ca_x Si(x=0, 0.03, 0.05, 0.07) thermoelectric materials have been prepared by solid state reaction and hot pressing techniques. The influence of Ca substitution on the thermoelectric properties has been investigated in detail. The XRD results proved that the prepared materials were single-phased. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured. Because of the electro negativity and ionic radius difference between Ca and Mg, the substitution of Ca for Mg reduces the thermal conductivity obviously, and improves the thermoelectric properties.
参考文献
| [1] | Zaitsev VK;Fedorov MI;Gurieva EA;Eremin IS;Konstantinov PP;Samunin AY;Vedernikov MV .Highly effective Mg2Si1-xSnx thermoelectrics[J].Physical review, B. Condensed matter and materials physics,2006(4):5207-1-5207-5-0. |
| [2] | Zhang Q;He J;Zhao XB;Zhang SN;Zhu TJ;Yin H;Tritt TM .In situ synthesis and thermoelectric properties of La-doped Mg-2(Si, Sn) composites[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2008(18):185103-1-185103-6-0. |
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