Reduced Lattice Thermal Conductivity for Improved Thermoelectric Performance through Non-equilibrium Processing

通过非平衡处理降低晶格热导率以提高热电性能

• 批准号: 453261231
• 负责人: Dr. Ran He
• 金额: --
• 依托单位: Institut für Metallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/453261231?language=en
• 关键词: Reduced; Lattice; Thermal; Conductivity; Improved

To improve the performance of thermoelectric (TE) materials, it is pivotal to drastically reduce the materials’ lattice thermal conductivity (κL). This is especially true for the high-power-factor materials such as the half-Heusler compounds where the TE performance is mainly limited by the remaining high values of κL. This project will take up the challenge to reduce the κL of half-Heusler compounds to an unprecedented level through microstructural modifications by employing non-equilibrium processing such as cryogenic milling, powder amorphization, and high pressure sintering, etc. The effectiveness of the proposed non-equilibrium processing is demonstrated in our preliminary results. Subsequent development will focus on process optimization to further decouple the transport of electron and phonon for substantial zT enhancement. Success of this project will facilitate the large-scale applications of TE materials in a variety of scenarios

要提高热电材料的性能，关键是要大幅度降低材料的晶格热导率（κL）。这对于高功率因数材料尤其如此，例如半Heusler化合物，其中TE性能主要受到剩余的高κL值的限制。该项目将采取的挑战，以减少半Heusler化合物的κL到前所未有的水平，通过微观结构的修改，采用非平衡处理，如低温研磨，粉末非晶化，高压烧结等，所提出的非平衡处理的有效性在我们的初步结果证明。随后的开发将集中在工艺优化，以进一步解耦电子和声子的传输，以大幅提高zT。该项目的成功将促进TE材料在各种场景中的大规模应用