一步法制备重费米子YbAl3热电材料及其性能提升

doi:10.15541/jim20220318

无机材料学报 ›› 2023, Vol. 38 ›› Issue (5): 577-582.DOI: 10.15541/jim20220318

一步法制备重费米子YbAl₃热电材料及其性能提升

贺丹琪¹(), 魏明旭², 刘蕤之², 汤志鑫², 翟鹏程¹, 赵文俞³()

1.武汉理工大学新材料力学理论与应用湖北省重点实验室, 武汉 430070
2.武汉理工大学材料科学与工程国际化示范学院, 武汉 430070
3.武汉理工大学材料复合新技术国家重点实验室, 武汉 430070

收稿日期:2022-06-05 修回日期:2022-06-27 出版日期:2022-07-08 网络出版日期:2022-07-08
通讯作者: 赵文俞, 教授. E-mail: wyzhao@whut.edu.cn
作者简介:贺丹琪(1990-), 讲师. E-mail: hedanqi@whut.edu.cn

Heavy-Fermion YbAl₃ Materials: One-step Synthesis and Enhanced Thermoelectric Performance

HE Danqi¹(), WEI Mingxu², LIU Ruizhi², TANG Zhixin², ZHAI Pengcheng¹, ZHAO Wenyu³()

1. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan 430070, China
2. International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Received:2022-06-05 Revised:2022-06-27 Published:2022-07-08 Online:2022-07-08
Contact: ZHAO Wenyu, professor. E-mail: wyzhao@whut.edu.cn
About author:HE Danqi (1990-), lecturer. E-mail: hedanqi@whut.edu.cn
Supported by:
National Key Research and Development Program of China(2018YFB0703603);National Key Research and Development Program of China(2019YFA0704903);National Natural Science Foundation of China(11834012);National Natural Science Foundation of China(52130203);National Natural Science Foundation of China(52102298);Foshan Xianhu Laboratory of the Advanced Energy Scienc eand Technology Guangdong Laboratory(XHT2020-004);National Innovation And Entrepreneurship Training Program for College Students(312040000245)

摘要/Abstract

摘要：

材料的微观结构对其物理性能调控起着至关重要的作用。本研究以Yb和Al单质为原料, 采用放电等离子烧结工艺通过一步法快速合成YbAl₃材料。显微结构表明, 快速制备的YbAl₃材料内部含有大量微米尺度晶粒、纳米晶粒、纳米非晶带和多种原子尺度位错等丰富的多尺度微结构, 这些多尺度微结构可以同时增强YbAl₃材料的电子和声子散射, 进而同时降低其晶格热导率(47%)和电子热导率(27%), 使得总热导率降低至13.4 W·K^-1·m^-1, YbAl₃材料的最大ZT可达0.35。该研究表明, 通过一步法放电等离子烧结工艺可以快速合成具有多尺度微结构的高热电性能YbAl₃块体材料。

关键词: YbAl₃热电材料, 一步法合成, 微结构, 热电性能

Abstract:

Microstructure plays a key role in tuning physical properties of materials. Here YbAl₃ materials with high figure of merit ZT of 0.35 at 300 K was directly synthesized with Yb and Al pure powders through one-step spark plasma sintering process in 10 min. The excellent thermoelectric performance is attributed to the simultaneous reduction in the lattice thermal conductivity by 47% and electronic thermal conductivity by 27% at 300 K. The remarkable decrease in the electronic thermal conductivity is ascribed to the enhanced scattering of electrons by nanocrystals with 5-20 nm in diameter, strip-like non-crystal with several nanometers in width and various atomic-scale distortions. The substantial decline in the lattice thermal conductivity originates from the enhanced scattering of phonons due to multi-scale microstructures spanning from nanoscale to mesoscale. This work demonstrates that one-step spark plasma sintering process is an efficient strategy to rapidly synthesize YbAl₃ materials with multi-scale microstructures and enhanced thermoelectric performance.

Key words: YbAl₃thermoelectric materials, one-step synthesis, microstructure, thermoelectric performance

中图分类号:

TQ174

贺丹琪, 魏明旭, 刘蕤之, 汤志鑫, 翟鹏程, 赵文俞. 一步法制备重费米子YbAl₃热电材料及其性能提升[J]. 无机材料学报, 2023, 38(5): 577-582.

HE Danqi, WEI Mingxu, LIU Ruizhi, TANG Zhixin, ZHAI Pengcheng, ZHAO Wenyu. Heavy-Fermion YbAl₃ Materials: One-step Synthesis and Enhanced Thermoelectric Performance[J]. Journal of Inorganic Materials, 2023, 38(5): 577-582.

图/表 5

Fig. 1 XRD patterns of SPS1, SPS2 and MQA-SPS samples

Fig. 2 Microstructures of SPS1, SPS2 and MQA-SPS samples (a-c) FESEM images of (a) MQA-SPS, (b) SPS1, and (c) SPS2; (d) Enlarged FESEM image of the rectangular region in (c)

Fig. 3 Multi-scale microstructures in SPS1 (a) HRTEM image of YbAl3 nanocrystals with 5-20 nm in diameter; (b) HRTEM image of nanoscale strip-like noncrystal in YbAl3 crystals; (c, d) HRTEM images of high-density distortions in YbAl3 crystals with insets showing IFFT images of the marked regions

Fig. 4 Temperature dependence of (a) electrical conductivity and (b) Seebeck coefficient for SPS1, SPS2 and MQA-SPS with inset showing the temperature dependence of power factor

Fig. 5 Temperature dependences of (a) thermal conductivity, (b) carrier thermal conductivity, (c) lattice thermal conductivity, and (d) ZT values for the samples for SPS1, SPS2 and MQA-SPS

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一步法制备重费米子YbAl₃热电材料及其性能提升

Heavy-Fermion YbAl₃ Materials: One-step Synthesis and Enhanced Thermoelectric Performance

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