Introduction

of nanophases is known to be effective in improving thermoelectric performance as it allows the simultaneous engineering of electronic and thermal transports. In this study, we synthesized Fe and Co nanoparticle-embedded MnSi_1.787Al_0.01 nanocomposites through a simple nanometal-decoration technique and spark plasma sintering. The nanoparticles introduced in the matrix caused energy band bending at the matrix–nanoparticle interface, which caused charge transfer and energy filtering effects. These two seemingly opposing effects were combined so as to increase the power factor of the nanocomposites by enhancing the electronic transport. Moreover, we found that the lattice thermal conductivity decreased owing to intensified phonon scattering. Hence, a maximum ZT of 0.53 (at 773 K) was achieved in 0.6 vol% Fe nanoparticle-embedded nanocomposites, which is 25% higher than that of the pristine sample.

中文翻译：

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通过引入铁和钴纳米粒子同步增强高锰硅化物的热电性能

介绍

已知纳米相的混合物有效地改善了热电性能，因为它允许同时进行电子和热传输工程。在这项研究中，我们通过简单的纳米金属修饰技术和火花等离子体烧结合成了嵌入Fe和Co纳米粒子的MnSi _1.787 Al _0.01纳米复合材料。引入基体中的纳米粒子在基体-纳米粒子的界面处引起能带弯曲，从而引起电荷转移和能量过滤效应。结合这两个看似相反的作用，以便通过增强电子传输来增加纳米复合材料的功率因数。此外，我们发现由于声子散射的增强，晶格热导率降低。因此，最大ZT 0.6％（体积）Fe纳米颗粒嵌入的纳米复合材料实现了0.53（在773 K处）的吸附，比原始样品高25％。