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<p>The synergistic cooling of thermoelectromagnetic materials promises a breakthrough in the efficiency of single refrigeration and has attracted extensive research. The study of heterogeneous interface is crucial for achieving the synergistic performance of both materials. In this work, a composite material comprising Bi<sub>2</sub>Te<sub>3</sub>-based thermoelectric material and MnCoGe-based magnetocaloric material is synthesized, which is a material exhibiting both thermoelectric and magnetocaloric properties. During the plasma-activated sintering process of the composite material, elemental interdiffusion of Mn, Co, Sb, and Te occurs, forming a diffusion layer of MnTe and CoSbTe. Reaction of heterogeneous interface leads to point defects within the material, significantly increasing the carrier concentration. Optimization of the sintering temperature results in a thermoelectric figure of merit (<i>ZT</i>) of 0.69 at 300 K and −Δ<i>S</i><sub>max</sub> of 0.97&#xa0;J&#xa0;kg<sup>−1</sup>&#xa0;K<sup>−1</sup> at room temperature under a 5 T magnetic field for the Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub>/10 wt% Mn<sub>0.9</sub>Cu<sub>0.1</sub>CoGe composite sintered at 623&#xa0;K and under 50&#xa0;MPa. This study demonstrates that Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub>/Mn<sub>0.9</sub>Cu<sub>0.1</sub>CoGe is a potential candidate for efficient thermoelectromagnetic cooling applications.</p>

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Heterogeneous Interface Microstructure and Thermoelectromagnetic Conversion Performance of BiSbTe/MnCoGe Multifunctional Materials

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Longli Wang,
  • Rongcheng Li,
  • Peilin Miao,
  • Jiushun Zhu,
  • Gangjian Tan,
  • Xinfeng Tang

摘要

The synergistic cooling of thermoelectromagnetic materials promises a breakthrough in the efficiency of single refrigeration and has attracted extensive research. The study of heterogeneous interface is crucial for achieving the synergistic performance of both materials. In this work, a composite material comprising Bi2Te3-based thermoelectric material and MnCoGe-based magnetocaloric material is synthesized, which is a material exhibiting both thermoelectric and magnetocaloric properties. During the plasma-activated sintering process of the composite material, elemental interdiffusion of Mn, Co, Sb, and Te occurs, forming a diffusion layer of MnTe and CoSbTe. Reaction of heterogeneous interface leads to point defects within the material, significantly increasing the carrier concentration. Optimization of the sintering temperature results in a thermoelectric figure of merit (ZT) of 0.69 at 300 K and −ΔSmax of 0.97 J kg−1 K−1 at room temperature under a 5 T magnetic field for the Bi0.5Sb1.5Te3/10 wt% Mn0.9Cu0.1CoGe composite sintered at 623 K and under 50 MPa. This study demonstrates that Bi0.5Sb1.5Te3/Mn0.9Cu0.1CoGe is a potential candidate for efficient thermoelectromagnetic cooling applications.