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Acta Physica Sinica, Volume. 69, Issue 14, 146801-1(2020)

Improving interface properties of Te based thermoelectric materials and composite electrodes

Jing-Yun Guo1, Shao-Ping Chen1、*, Wen-Hao Fan2, Ya-Ning Wang1, and Yu-Cheng Wu1
Author Affiliations
  • 1College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • 2College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (13)
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    Figures & Tables(13)
    Schematic diagram of (a) thermoelectric joint Te/Fe interface contact resistance test and (b) shear strength test of Te/β(FeTe)/Fe gradient structure.

    Fig. 1. Schematic diagram of (a) thermoelectric joint Te/Fe interface contact resistance test and (b) shear strength test of Te/β(FeTe)/Fe gradient structure.

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    (a) Back scattering image of the Te/Fe interface; elemental mappings of (b) Fe and (c) Te, respectively; (d) elemental composition spectrum of new phase at the Te/Fe interface.

    Fig. 2. (a) Back scattering image of the Te/Fe interface; elemental mappings of (b) Fe and (c) Te, respectively; (d) elemental composition spectrum of new phase at the Te/Fe interface.

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    Binary phase diagram of Fe-Te (Quoted from the materials information society, ASM Interantional).

    Fig. 3. Binary phase diagram of Fe-Te (Quoted from the materials information society, ASM Interantional).

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    The electrical properties of β(FeTe) and ε(FeTe2): (a) Resistivity; (b) Seebeck coefficient.

    Fig. 4. The electrical properties of β(FeTe) and ε(FeTe2): (a) Resistivity; (b) Seebeck coefficient.

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    Microstructure of gradient bonding structure: (a) Te/FeTe/Fe interface; (b), (c) Te/ε(FeTe2)/Fe interface; (d) EDS line scanning of Te/β(FeTe)/Fe.

    Fig. 5. Microstructure of gradient bonding structure: (a) Te/FeTe/Fe interface; (b), (c) Te/ε(FeTe2)/Fe interface; (d) EDS line scanning of Te/β(FeTe)/Fe.

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    Schematic diagram of Te/β(FeTe)/Fe interface contact resistance test.

    Fig. 6. Schematic diagram of Te/β(FeTe)/Fe interface contact resistance test.

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    Microstructure morphology and elemental distribution of the β(FeTe)-Te fracture interface of Te/β(FeTe)/Fe.

    Fig. 7. Microstructure morphology and elemental distribution of the β(FeTe)-Te fracture interface of Te/β(FeTe)/Fe.

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    Interface structure pictures of Te/β(FeTe)/Fe after annealing at 553 K for different time: (a1), (a2) 0 d; (b1), (b2) 7 d; (c1), (c2) 10 d; (d1), (d2) 15 d.

    Fig. 8. Interface structure pictures of Te/β(FeTe)/Fe after annealing at 553 K for different time: (a1), (a2) 0 d; (b1), (b2) 7 d; (c1), (c2) 10 d; (d1), (d2) 15 d.

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    Interfacial structure picture of Te/β(FeTe)/Fe after annealing at 573 K for 10 d.

    Fig. 9. Interfacial structure picture of Te/β(FeTe)/Fe after annealing at 573 K for 10 d.

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    Changes in interface properties of Te/β(FeTe)/Fe after annealing at 553 K for different time: (a) β(FeTe)-Fe interface; (b) β(FeTe)-Te interface.

    Fig. 10. Changes in interface properties of Te/β(FeTe)/Fe after annealing at 553 K for different time: (a) β(FeTe)-Fe interface; (b) β(FeTe)-Te interface.

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    Change of interface resistivity with aging time and temperature: (a), (c) β(FeTe)-Fe interface; (b), (d) β(FeTe)-Te interface

    Fig. 11. Change of interface resistivity with aging time and temperature: (a), (c) β(FeTe)-Fe interface; (b), (d) β(FeTe)-Te interface

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    • Table 1.

      EDS point scanning results of Te/β(FeTe)/Fe and Fe/ε(FeTe2)/Fe.

      梯度连接结构Te/β(FeTe)/Fe和 Te/ε(FeTe2)/Fe区域成分扫描结果

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      Table 1.

      EDS point scanning results of Te/β(FeTe)/Fe and Fe/ε(FeTe2)/Fe.

      梯度连接结构Te/β(FeTe)/Fe和 Te/ε(FeTe2)/Fe区域成分扫描结果

      Point numberFe /at.%Te /at.%
      b1 0100.00
      b2 29.9270.08
      b3 50.3049.70
      b4 100.000
      b5 31.0568.95
      b6 17.1082.90

    • Table 2.

      EDS scanning results of characteristic points of β(FeTe)-Te fracture interface.

      β(FeTe)-Te界面断口特征点EDS成分扫描结果

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      Table 2.

      EDS scanning results of characteristic points of β(FeTe)-Te fracture interface.

      β(FeTe)-Te界面断口特征点EDS成分扫描结果

      Point numberFe/at.%Te/at.%
      124.6675.34
      260.1739.83
      32.5497.46
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    Jing-Yun Guo, Shao-Ping Chen, Wen-Hao Fan, Ya-Ning Wang, Yu-Cheng Wu. Improving interface properties of Te based thermoelectric materials and composite electrodes[J]. Acta Physica Sinica, 2020, 69(14): 146801-1

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    Paper Information

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    Received: Mar. 24, 2020

    Accepted: --

    Published Online: Dec. 28, 2020

    The Author Email:

    DOI:10.7498/aps.69.20200436

    Topics

    Nuclear physics
    Particles and fields
    Particle and nuclear astrophysics and cosmology