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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Morphological effects on the thermoelectric properties of Ti0.3Zr0.35Hf0.35Ni1+delta Sn alloys following phase separation
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Morphological effects on the thermoelectric properties of Ti0.3Zr0.35Hf0.35Ni1+delta Sn alloys following phase separation

机译：相分离后形态对Ti0.3Zr0.35Hf0.35Ni1 +δSn合金热电性能的影响

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摘要

Thermoelectrics are known as one of the emerging renewable power generation technologies. Half-Heusler based semiconducting intermetallic compounds show high potential as thermoelectric materials due to the abundance of their elements in nature, their high mechanical and chemical stability, and their favorable electronic properties. Their main limitation lies in their high lattice thermal conductivity, k(l). In the current research, the potential of kl reduction due to generation of composites based on phase separation of off-stoichiometric Ti0.3Zr0.35Hf0.35Ni1+delta Sn alloys into half-and full-Heusler composites was investigated. Due to the strong metallic nature of the full-Heusler phase, its electronic effect on the thermoelectric transport properties under various morphological and compositional conditions was analyzed by the general effective media (GEM) approach. It was shown that although a major kl reduction of up to similar to 37% was associated with phonon scattering by the embedded full Heusler phase, the electronic properties for the parallel-like alignment of this phase, following arc melting and spark plasma sintering, deteriorated with increase of the relative amount of this phase. Therefore a maximal ZT enhancement of similar to 41%, compared to the uni-phase HH stoichiometric composition, was obtained for the minimal (delta = 0.01) deviation of the stoichiometry examined, corresponding to the minimal relative amount of the scattered FH phase inside the HH matrix.
机译：热电是众所周知的新兴可再生能源发电技术之一。基于半霍斯勒的半导体金属间化合物由于其自然界中的元素丰富，机械和化学稳定性高以及良好的电子性能而具有作为热电材料的高潜力。它们的主要局限在于它们的高晶格导热率k（l）。在当前的研究中，研究了基于非化学计量的Ti0.3Zr0.35Hf0.35Ni1 + delta Sn合金相分离为半霍斯勒复合材料和全霍斯勒复合材料导致的复合材料生成导致kl降低的可能性。由于全Heusler相的强金属性质，通过通用有效介质（GEM）方法分析了其在各种形态和组成条件下对热电输运性质的电子效应。结果表明，尽管嵌入的完整Heusler相与声子散射相关联，其最大kl降低幅度高达37％，但是在电弧熔化和火花等离子体烧结之后，该相的平行状排列的电子性能却恶化了随着该阶段相对数量的增加。因此，对于所检查的化学计量的最小（δ= 0.01）偏差，获得了与单相HH化学计量组成相比最大的ZT增强，类似于41％，这对应于FH相内部散射FH相的最小相对量。 HH矩阵。

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