In situ synthesis and thermoelectric properties of La-doped Mg2(Si, Sn) composites

In situ synthesis and thermoelectric properties of La-doped Mg2(Si, Sn) composites
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La掺杂Mg2(Si,Sn)复合材料的原位合成及其热电性能

DOI:
10.1088/0022-3727/41/18/185103
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发表时间:
2008-08
期刊:
Journal of Physics D: Applied Physics
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利用镁硅和镁锡伪二元相图中的包晶反应和互溶间隙,我们制备了环境友好型镁(Si, )热电(TE)复合材料,在富镁硅块体颗粒上原位包覆了富镁锡薄膜。对富镁锡晶界相进行了La的选择性掺杂。结果表明,La掺杂显著提高了复合材料的导热比。结果表明,在810 K时,x=0.005的−xLax(Si, Sn)原位复合材料的无量纲优值系数ZT∼为0.81,显著高于未掺杂复合材料的ZT∼0.18,与目前最先进的PbTe中温Te合金的ZT PbTe 0.8相当。
Utilizing the peritectic reaction and the miscibility gap featured in the pseudo-binary phase diagram of Mg2Si and Mg2Sn, we fabricated environmentally friendly Mg2(Si, Sn) thermoelectric (TE) composites in which the Mg2Si-rich bulk grains were in situ coated by Mg2Sn-rich thin layers. The Mg2Sn-rich grain boundary phase was selectively doped with La. It was found that the La doping dramatically increased the electrical conductivity to thermal conductivity ratio in the composites. As a result, a dimensionless figure of merit ZT ∼ 0.81 has been attained at 810 K for the Mg2−xLax(Si, Sn) in situ composite with x = 0.005, significantly higher than the ZT ∼0.18 at 540 K for the undoped composite and comparable to ZT ∼ 0.8 of state-of-the-art PbTe intermediate temperature TE alloys.
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