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Interfacial Reaction Between Nb Foil and n-Type PbTe Thermoelectric Materials During Thermoelectric Contact Fabrication

Xia, Haiyang and Chen, Cheng-Lung and Drymiotis, Fivos and Wu, Aiping and Chen, Yang-Yuan and Snyder, G. Jeffrey (2014) Interfacial Reaction Between Nb Foil and n-Type PbTe Thermoelectric Materials During Thermoelectric Contact Fabrication. Journal of Electronic Materials, 43 (11). pp. 4064-4069. ISSN 0361-5235. http://resolver.caltech.edu/CaltechAUTHORS:20140825-095722948

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Abstract

PbTe is a high-conversion-efficiency thermoelectric (TE) material that is commonly used in space exploration applications. Integration of PbTe in TE devices has a significant impact on the conversion efficiency and reliability of TE devices. Hence, our effort focuses on developing novel approaches for bonding metallic contacts to PbTe to improve device performance and reliability. In this study, pure Nb foil was directly bonded to PbTe-based TE materials to fabricate the hot-side contacts of TE elements using a rapid hot-press. The materials were sintered at 700°C under pressure of 40 MPa for various holding times. We found that a reaction layer of needle-like Nb_3Te_4 mixed with Pb forms at the interface of the Nb/PbTe joints and that Pb is distributed in the gaps of the Nb_3Te_4 grains. We analyze the resulting microstructure and finally calculate the time exponent of the growth kinetics of the Nb_3Te_4 layer. Fracture surface analysis showed that the Nb/PbTe joint fractures at the interface between Nb and Nb_3Te_4 and within the PbTe matrix, indicating that the bonding between Nb and Nb_3Te_4 is weak.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://link.springer.com/article/10.1007/s11664-014-3350-8PublisherArticle
http://dx.doi.org/10.1007/s11664-014-3350-8DOIArticle
http://rdcu.be/ttfmPublisherFree ReadCube access
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2014 The Minerals, Metals & Materials Society. Received May 20, 2014; accepted July 22, 2014. Published online: 19 August 2014. H.X. would like to thank the Tsinghua Visiting Doctoral Students Foundation and the Opening Project of State Key Laboratory of Advanced Brazing Filler Metals & Technology (Zhengzhou Research Institute of Mechanical Engineering) for support.
Funders:
Funding AgencyGrant Number
Tsinghua Visiting Doctoral Students FoundationUNSPECIFIED
Opening Project of State Key Laboratory of Advanced Brazing Filler Metals & TechnologyUNSPECIFIED
Zhengzhou Research Institute of Mechanical EngineeringUNSPECIFIED
Subject Keywords:PbTe-based thermoelectric materials, Nb foil, Nb/PbTe joints, hot-press sintering
Record Number:CaltechAUTHORS:20140825-095722948
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140825-095722948
Official Citation:Xia, H., Chen, CL., Drymiotis, F. et al. Journal of Elec Materi (2014) 43: 4064. doi:10.1007/s11664-014-3350-8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48839
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:25 Aug 2014 19:17
Last Modified:14 Jun 2017 23:58

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