LayFeCo3.0Sb12热电化合物的原位反应合成及热电性能

In-situ synthesis of skutterudite compounds LayFeCo3.0Sb12 and its characterisation

    摘要
  • 摘要: 以Co、Sb、Fe及La为起始原料,采用放电等离子烧结(SPS)技术原位反应合成了填充式方钴矿化合物LayFeCo3.0Sb12(y=0～0.4)。实验结果表明,在y=0～0.3组成范围内,P型传导的LayFeCo3.0Sb12化合物为试样中的主晶相,并伴有极少量的Sb相;当Fe含量固定为1.0时,La的饱和填充分数达到0.3。在填充分数小于最大填充分数时,填充化合物的晶格常数随La填充分数的增加而增加。LayFeCo3.0Sb12化合物的电导率和热导率随着La填充量的增加而降低,Seebeck系数随着La填充量的增加而增加,功率因子随温度升高而升高。填充分数为0.3时,La0.3FeCo3.0Sb12化合物有较高的热电性能,其中在773K时具有最大的热电优值(ZT值)0.56。

     

    Abstract: The filled skutterudite compound of LayFeCo3.0Sb12（y=0-0.4） were prepared by in-situ spark plasma sintering（SPS） technology using Co, Sb, Fe and La powders. The results show that the skutterudite phase is predominant in all the samples with small amounts of Sb when 0＜y≤0.3; the maximum filling fraction of La is 0.3 for LayFeCo3.0Sb12, The lattice constant and Seebeck coefficient increase with increasing Lafilling, while the electrical conductivity and thermoelectric conductivity decrease. The power factor increases with the temperature. All the La-filling compounds of LayFeCo3.0Sb12 behave as p-type conduction. The LayFeCo3.0Sb12 compound has higher thermoelectric property when y is 0.3, the maximum value of the dimensionless figure of merit（ZT） is 0.56 at 773K.

     

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