多晶TaSb2的热磁性能研究

doi:10.15541/jim20250264

无机材料学报 ›› 2026, Vol. 41 ›› Issue (3): 303-310.DOI: 10.15541/jim20250264 CSTR: 32189.14.jim20250264

多晶TaSb₂的热磁性能研究

李鹏¹(), 仇鹏飞²(), 江彬彬¹(), 肖杰², 史迅²

1.电子科技大学(深圳)高等研究院, 深圳 518110
2.中国科学院上海硅酸盐研究所, 关键陶瓷材料全国重点实验室, 上海 200050

收稿日期:2025-06-23 修回日期:2025-08-11 出版日期:2025-08-26 网络出版日期:2025-08-26
通讯作者: 仇鹏飞, 研究员. E-mail: qiupf@mail.sic.ac.cn;
江彬彬, 教授. E-mail: jiangbb@uestc.edu.cn
作者简介:李鹏(1995-), 男, 博士. E-mail: pengli@whu.edu.cn
基金资助:
国家自然科学基金(52402229);中国博士后科学基金(2024M750346)

Thermomagnetic Performance of Polycrystalline TaSb₂

LI Peng¹(), QIU Pengfei²(), JIANG Binbin¹(), XIAO Jie², SHI Xun²

1. Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518110, China
2. State Key Laboratory of High Performance Ceramics, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received:2025-06-23 Revised:2025-08-11 Published:2025-08-26 Online:2025-08-26
Contact: QIU Pengfei, professor. E-mail: qiupf@mail.sic.ac.cn;
JIANG Binbin, professor. E-mail: jiangbb@uestc.edu.cn
About author:LI Peng (1995-), male, PhD. E-mail: pengli@whu.edu.cn
Supported by:
National Natural Science Foundation of China(52402229);China Postdoctoral Science Foundation(2024M750346)

摘要/Abstract

摘要：

基于埃廷豪森效应的热磁制冷是一种低温固态制冷技术, 具有控温精确、体积小、无振动、无噪声等优点。近年来, 拓扑半金属因兼具电子与空穴两种载流子及高迁移率, 在低温下表现出优异的热磁性能, 成为潜在候选材料。本研究采用固相反应与放电等离子烧结工艺制备了高致密度多晶TaSb₂, 并系统测试其低温热磁输运性质。结果表明, 多晶TaSb₂的能斯特热电势(S_yx)在27 K附近达到最大值, 且表现出与磁场的正相关关系。多晶TaSb₂在9 T、26 K条件下的能斯特功率因子((PF)_N)达到315.1 μW·cm^-1·K^-2, 在9 T、22 K条件下的能斯特热电优值(z_N)达到7.1×10^-4 K^-1, 均优于大部分已报道的多晶热磁材料。机理分析发现, 强双极效应、高载流子迁移率及显著的声子曳引效应共同提升了其热电势, 从而赋予材料优异的热磁性能。此外, 磁场可显著抑制低温下的电子热导率, 导致磁场下总热导率主要来自于晶格贡献。本研究为低温固态制冷提供了新的材料选择和设计思路, 然而得到的材料晶格热导率较高, 在一定程度上限制了材料性能, 未来通过声子工程降低晶格热导率有望进一步优化性能。

关键词: 拓扑半金属, 多晶TaSb₂, 热磁效应, 双极效应, 声子曳引

Abstract:

Thermomagnetic refrigeration based on the Ettingshausen effect is a low-temperature solid-state cooling technology with advantages of precise temperature control, compact size and noiseless operation. In recent years, topological semimetals, which possess both electrons and holes as charge carriers and exhibit high carrier mobility, have shown excellent thermomagnetic performance at low temperatures, making them promising candidates for cryogenic applications. In this study, highly dense polycrystalline TaSb₂ was synthesized via solid-state reaction followed by spark plasma sintering, and its low-temperature thermomagnetic transport properties were systematically investigated. The results show that the Nernst thermopower (S_yx) peaks at around 27 K and increases with applied magnetic field. Under 9 T and 26 K, the Nernst power factor ((PF)_N) reaches 315.1 μW·cm^-1·K^-2, while under 9 T and 22 K, the Nernst figure of merit (z_N) is 7.1×10^-4 K^-1, both outperforming most reported polycrystalline thermomagnetic materials. Mechanistic analysis indicates that the high performance originates from the combined effects of strong bipolar effect, high carrier mobility and significant phonon-drag enhancement of thermopower. Moreover, magnetic fields markedly suppress the electronic contribution to thermal conductivity at low temperatures, making the total thermal conductivity predominantly determined by the lattice component. This work offers a new material option and design strategy for low-temperature solid-state cooling applications. The relatively high lattice thermal conductivity partially limits the thermomagnetic performance, and further reduction via phonon engineering could lead to substantial improvements.

Key words: topological semimetal, polycrystalline TaSb₂, thermomagnetic effect, bipolar effect, phonon drag

中图分类号:

TB34

李鹏, 仇鹏飞, 江彬彬, 肖杰, 史迅. 多晶TaSb₂的热磁性能研究[J]. 无机材料学报, 2026, 41(3): 303-310.

LI Peng, QIU Pengfei, JIANG Binbin, XIAO Jie, SHI Xun. Thermomagnetic Performance of Polycrystalline TaSb₂[J]. Journal of Inorganic Materials, 2026, 41(3): 303-310.

图/表 5

图1 多晶TaSb2的晶体结构、能带结构和物相分析

Fig. 1 Crystal structure, band structure and phase analysis of polycrystalline TaSb2 (a) Schematic representation of the unit cell; (b) Band structure with spin-orbit coupling considered; (c) Powder XRD pattern and Rietveld refinement results; (d) Secondary electron images of cross-section after acid pickling (upper left) and polished surface (upper right), and corresponding elemental mappings (lower)

图2 多晶TaSb2的电输运性质

Fig. 2 Electrical transport properties of polycrystalline TaSb2 Temperature dependences of (a) Seebeck thermopower Sxx, (b) Nernst thermopower Syx, (c) electrical resistivity ρyy, and (d) Nernst power factor (PF)N of polycrystalline TaSb2 under different magnetic fields

图3 多晶TaSb2的电输运性能分析

Fig. 3 Analysis of the electrical transport properties of polycrystalline TaSb2 (a, b) Comparison between experimental data and two-carrier model fitting results for (a) resistivity ρyy and (b) Hall resistivity ρyx of polycrystalline TaSb2 (dots representing experimental data and lines representing fitting results); (c) Temperature dependences of electron concentration ne and hole concentration nh in polycrystalline TaSb2 with inset showing temperature dependences of electron mobility μe and hole mobility μh; (d, e) Comparison between experimental and theoretical values of Nernst thermopower Syx at (d) low temperatures (15, 25, 35 and 50 K) and (e) high temperatures (above 150 K); (f) Contributions of thermal diffusion and phonon drag to the thermopower of electrons (${S}_{\text{d}}^{\text{e}}$ and ${S}_{\text{p}}^{\text{e}}$) and holes (${S}_{\text{d}}^{\text{h}}$ and ${S}_{\text{p}}^{\text{h}}$)

图4 多晶TaSb2的热输运性质与性能评价

Fig. 4 Thermal transport properties and performance evaluation of polycrystalline TaSb2 (a) Temperature dependence and (b) magnetic field dependence of thermal conductivity κxx of polycrystalline TaSb2; (c) Temperature dependence and (d) magnetic field dependence of Nernst figure-of-merit zN of polycrystalline TaSb2

表1 TaSb2热导率的拟合参数

Table 1 Parameters used to fit the thermal electric conductivity of polycrystalline TaSb2

T/K	κ_l/(W·m^-1·K^-1)	κ_c(0, T)/(W·m^-1·K^-1)	η/T^-1	s
5	1.17	5.92	1.190	1.41
15	13.71	11.68	0.790	1.58
25	36.81	12.72	0.400	1.54
50	45.83	9.26	0.114	1.45
100	29.66	7.14	0.043	1.56
150	21.47	7.85	0.033	1.88
200	17.51	8.34	0.029	1.81
250	15.49	8.41	0.026	1.91
300	14.90	8.53	0.023	1.90

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多晶TaSb₂的热磁性能研究

Thermomagnetic Performance of Polycrystalline TaSb₂

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