TY - JOUR
T1 - Enhancing Interfacial Properties of Mg2Si-Based Thermoelectric Joint with Mg2SiNi3 Compound as Electrodes
AU - Chen, Shaoping
AU - Chen, Yanzuo
AU - Ohno, Saneyuki
AU - Xu, Libin
AU - Fan, Wenhao
AU - Xue, Lin
AU - Ferhat, Marhoun
AU - Wu, Yucheng
N1 - Funding Information:
The authors gratefully acknowledge the financial support from the National Science Foundation of China through grant no. 51775366, the Shanxi Province Science Foundation through grant nos. 201801D121017, 201901D111116, and the Shanxi Scholarship Council of China through nos. 2017‐050 and 2017‐028. S.O. acknowledges the financial support of Alexander Humboldt foundation.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/8/1
Y1 - 2020/8/1
N2 - The phase component and its evolution during aging at the joint between thermoelectric (TE) materials and electrodes are of much importance to the quality and the performance of the TE devices. While the figure of merit zT of TE materials determines the maximum efficiency of TE devices, undesired side reactions causing the growing interfacial resistance or mechanical failures between TEs and metal electrodes limit the actual performance of devices. Herein, the candidate electrode materials (Mg2Ni and Mg2SiNi3) for Mg2Si are explored, which is one of the cost-effective and environmentally friendly TE materials exhibiting high zT. The electrodes are directly bonded to Mg2Si by field-activated pressure-Assisted sintering (FAPAS) in one-step process. The interfaces of fabricated joints with different sintering times are monitored by electron microscopy, followed by the measurement of shear strength and the contact resistances. Outperforming strength (28.29 MPa) and contact resistance (63 μΩ cm2) are observed with Mg2SiNi3 at the joint bonded for 30 min. A long-term stability test on Mg2SiNi3/Mg2Si joint reveals a minute increase in the contact resistance as well as sufficient mechanical stability, suggesting that Mg2SiNi3 is a great candidate of the electrode materials for Mg2Si.
AB - The phase component and its evolution during aging at the joint between thermoelectric (TE) materials and electrodes are of much importance to the quality and the performance of the TE devices. While the figure of merit zT of TE materials determines the maximum efficiency of TE devices, undesired side reactions causing the growing interfacial resistance or mechanical failures between TEs and metal electrodes limit the actual performance of devices. Herein, the candidate electrode materials (Mg2Ni and Mg2SiNi3) for Mg2Si are explored, which is one of the cost-effective and environmentally friendly TE materials exhibiting high zT. The electrodes are directly bonded to Mg2Si by field-activated pressure-Assisted sintering (FAPAS) in one-step process. The interfaces of fabricated joints with different sintering times are monitored by electron microscopy, followed by the measurement of shear strength and the contact resistances. Outperforming strength (28.29 MPa) and contact resistance (63 μΩ cm2) are observed with Mg2SiNi3 at the joint bonded for 30 min. A long-term stability test on Mg2SiNi3/Mg2Si joint reveals a minute increase in the contact resistance as well as sufficient mechanical stability, suggesting that Mg2SiNi3 is a great candidate of the electrode materials for Mg2Si.
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U2 - 10.1002/pssa.201901035
DO - 10.1002/pssa.201901035
M3 - Article
AN - SCOPUS:85086036518
VL - 217
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
SN - 1862-6300
IS - 15
M1 - 1901035
ER -