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首页> 外文会议>Nanoscale thermoelectric materials: Thermal and electrical transport, and applications to solid-state cooling and power generation >Fabrication and Characterization of Nanostructured Bulk Skutterudites
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Fabrication and Characterization of Nanostructured Bulk Skutterudites

机译：纳米结构块状方钴矿的制备与表征

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摘要

Latest nanotechnology concepts applied in thermoelectric (TE) research have opened many new avenues to improve the ZT value. Low dimensional structures can improve the ZT value as compared to bulk materials by substantial reduction in the lattice thermal conductivity, k_l. However, the materials were not feasible for the industrial scale production of macroscopic devices because of complicated and costly manufacturing processes involved. Bulk nanostructured (NS) TEs are normally fabricated using a bulk process rather than a nano-fabrication process, which has the important advantage of producing in large quantities and in a form that is compatible with commercially available TE devices. We developed fabrication strategies for bulk nanostructured skutterudite materials based on Fe_xCo_(1-x)Sb_3. The process is based on precipitation of a precursor material with the desired metal atom composition, which is then exposed to thermochemical processing of calcination followed by reduction. The resultant material thus formed maintains nanostructured particles which are then compacted using Spark Plasma Sintering (SPS) by utilizing previously optimized process parameters. Microstructure, crystallinity, phase composition, thermal stability and temperature dependent transport property evaluation has been performed for compacted NS Fe_xCo_(1-x)Sb_3. Evaluation results are presented in detail, suggesting the feasibility of devised strategy for bulk quantities of doped TE nanopowder fabrication.
机译：热电（TE）研究中应用的最新纳米技术概念为提高ZT值开辟了许多新途径。与大块材料相比，低尺寸结构可通过大幅度降低晶格热导率k_1来提高ZT值。然而，由于涉及复杂且昂贵的制造工艺，因此该材料对于工业规模的宏观装置的生产是不可行的。通常使用本体工艺而不是纳米加工工艺来制造本体纳米结构（NS）TE，这具有大量生产和以与市售TE器件兼容的形式生产的重要优点。我们开发了基于Fe_xCo_（1-x）Sb_3的整体纳米结构方钴矿材料的制造策略。该方法基于具有所需金属原子组成的前体材料的沉淀，然后将其暴露于煅烧的热化学处理中，然后还原。由此形成的所得材料保持纳米结构的颗粒，然后通过利用先前优化的工艺参数使用火花等离子体烧结（SPS）将其压实。对压实的NS Fe_xCo_（1-x）Sb_3进行了微观结构，结晶度，相组成，热稳定性和与温度有关的传输性能评估。评估结果进行了详细介绍，表明设计策略用于大量掺杂TE纳米粉体制造的可行性。

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