Enhanced thermoelectric and mechanical properties of p-type skutterudites with in situ formed Fe3Si nanoprecipitate,Inorganic Chemistry Frontiers

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Enhanced thermoelectric and mechanical properties of p-type skutterudites with in situ formed Fe3Si nanoprecipitate
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-08-23 00:00:00 , DOI: 10.1039/c7qi00304h
Shengyuan Peng _{1,

2,

3,

4} , Jianhui Sun _{3,

4,

5} , Bo Cui _{1,

2,

3,

4} , Xianfu Meng _{1,

2,

3,

4} , Dandan Qin _{1,

2,

3,

4} , Zihang Liu _{1,

2,

3,

4} , Wei Cai _{1,

2,

3,

4}

Affiliation

In the present work, p-type skutterudites La_0.8Ti_0.1Ga_0.1Fe₃CoSb₁₂ composite with n-type Fe₃Si nanoprecipitate was fabricated via an in situ method. Both thermoelectric and mechanical properties of La_0.8Ti_0.1Ga_0.1Fe₃CoSb₁₂/xFe₃Si composites were thoroughly investigated. With the introduction of homogeneously dispersed nanosized Fe₃Si in the matrix, the power factor is almost unchanged due to the counteraction between the decreased electrical conductivity and the significantly enhanced Seebeck coefficient. Simultaneously, the total thermal conductivity was decreased for samples with Fe₃Si nanoprecipitate because of the reduced electronic thermal conductivity. As a result, a ZT value of about 1.2 at 700 K has been achieved for La_0.8Ti_0.1Ga_0.1Fe₃CoSb₁₂/0.1Fe₃Si sample, whose ZT value was slightly enhanced in comparison with the Fe₃Si-freeLa_0.8Ti_0.1Ga_0.1Fe₃CoSb₁₂ sample. Furthermore, the indentation fracture toughness of La_0.8Ti_0.1Ga_0.1Fe₃CoSb₁₂/0.1Fe₃Si was improved by nearly 30% compared to the Fe₃Si-free skutterudites.

中文翻译：

具有原位形成的Fe ₃ Si纳米沉淀的p型方钴矿的增强的热电和机械性能

另外，在本工作中，p型方钴矿的La _0.8钛_0.1镓_0.1的Fe ₃的CoSb ₁₂复合有n型的Fe ₃的Si nanoprecipitate制作经由一个原位方法。彻底研究了La _0.8 Ti _0.1 Ga _0.1 Fe ₃ CoSb ₁₂ / x Fe ₃ Si复合材料的热电性能和机械性能。随着均匀分散的纳米Fe ₃的引入在矩阵Si中，由于电导率降低和塞贝克系数显着提高之间的反作用，功率因数几乎没有变化。同时，由于电子热导率降低，具有Fe ₃ Si纳米沉淀的样品的总热导率降低。其结果是，一个ZT为约1.2，在700 K值已经达到的La _0.8钛_0.1镓_0.1的Fe ₃的CoSb ₁₂ /0.1Fe ₃的Si的样品，其ZT值与铁相比略微增强₃的Si-freeLa _0.8钛_0.1 Ga_0.1 Fe₃ CoSb₁₂样品。此外，与不含Fe₃ Si的方钴矿相比，La_0.8 Ti_0.1 Ga_0.1 Fe₃ CoSb₁₂ /0.1Fe₃ Si的压痕断裂韧性提高了近30％。

更新日期：2017-09-07

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