Interfacial reactions in Ni/CoSb3 couples at 450 °c

Wei An Chen, Sinn Wen Chen, Ssu Ming Tseng, Haw Wen Hsiao, Yang Yuan Chen, G. Jeffrey Snyder, Yinglu Tang

Research output: Contribution to journalLetter

8 Citations (Scopus)

Abstract

CoSb3-based alloys are promising thermoelectric materials, and nickel is commonly used as barrier layer. This study examines interfacial reactions in the Ni/Sb and Ni/CoSb3 couples reacted at 723 K. Three reaction phases, Ni5Sb2, NiSb and NiSb2, are found in the Ni/Sb couples. In the Ni/CoSb3 couples, the reaction path is Ni/Ni5Sb2/(Co,Ni)Sb/CoSb3. Nickel is the fastest diffusion species, and the growth front is at the (Co,Ni)Sb/CoSb3 interface. Co is the second fastest diffusion species, and a Co-rich region is formed at the Ni phase. The reaction layers grow with longer reaction time. Their average growth rates in the Ni/Sb and Ni/CoSb3 couples reacted for 20 h are 1.1 μm/h and 1.0 μm/h, respectively.

Original languageEnglish (US)
Pages (from-to)500-504
Number of pages5
JournalJournal of Alloys and Compounds
Volume632
DOIs
StatePublished - May 25 2015

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Surface chemistry
Nickel

Keywords

  • CoSb
  • Interfacial reaction
  • Ni
  • Thermoelectric

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Chen, W. A., Chen, S. W., Tseng, S. M., Hsiao, H. W., Chen, Y. Y., Snyder, G. J., & Tang, Y. (2015). Interfacial reactions in Ni/CoSb3 couples at 450 °c. Journal of Alloys and Compounds, 632, 500-504. https://doi.org/10.1016/j.jallcom.2015.01.176
Chen, Wei An ; Chen, Sinn Wen ; Tseng, Ssu Ming ; Hsiao, Haw Wen ; Chen, Yang Yuan ; Snyder, G. Jeffrey ; Tang, Yinglu. / Interfacial reactions in Ni/CoSb3 couples at 450 °c. In: Journal of Alloys and Compounds. 2015 ; Vol. 632. pp. 500-504.
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Chen, WA, Chen, SW, Tseng, SM, Hsiao, HW, Chen, YY, Snyder, GJ & Tang, Y 2015, 'Interfacial reactions in Ni/CoSb3 couples at 450 °c', Journal of Alloys and Compounds, vol. 632, pp. 500-504. https://doi.org/10.1016/j.jallcom.2015.01.176

Interfacial reactions in Ni/CoSb3 couples at 450 °c. / Chen, Wei An; Chen, Sinn Wen; Tseng, Ssu Ming; Hsiao, Haw Wen; Chen, Yang Yuan; Snyder, G. Jeffrey; Tang, Yinglu.

In: Journal of Alloys and Compounds, Vol. 632, 25.05.2015, p. 500-504.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Interfacial reactions in Ni/CoSb3 couples at 450 °c

AU - Chen, Wei An

AU - Chen, Sinn Wen

AU - Tseng, Ssu Ming

AU - Hsiao, Haw Wen

AU - Chen, Yang Yuan

AU - Snyder, G. Jeffrey

AU - Tang, Yinglu

PY - 2015/5/25

Y1 - 2015/5/25

N2 - CoSb3-based alloys are promising thermoelectric materials, and nickel is commonly used as barrier layer. This study examines interfacial reactions in the Ni/Sb and Ni/CoSb3 couples reacted at 723 K. Three reaction phases, Ni5Sb2, NiSb and NiSb2, are found in the Ni/Sb couples. In the Ni/CoSb3 couples, the reaction path is Ni/Ni5Sb2/(Co,Ni)Sb/CoSb3. Nickel is the fastest diffusion species, and the growth front is at the (Co,Ni)Sb/CoSb3 interface. Co is the second fastest diffusion species, and a Co-rich region is formed at the Ni phase. The reaction layers grow with longer reaction time. Their average growth rates in the Ni/Sb and Ni/CoSb3 couples reacted for 20 h are 1.1 μm/h and 1.0 μm/h, respectively.

AB - CoSb3-based alloys are promising thermoelectric materials, and nickel is commonly used as barrier layer. This study examines interfacial reactions in the Ni/Sb and Ni/CoSb3 couples reacted at 723 K. Three reaction phases, Ni5Sb2, NiSb and NiSb2, are found in the Ni/Sb couples. In the Ni/CoSb3 couples, the reaction path is Ni/Ni5Sb2/(Co,Ni)Sb/CoSb3. Nickel is the fastest diffusion species, and the growth front is at the (Co,Ni)Sb/CoSb3 interface. Co is the second fastest diffusion species, and a Co-rich region is formed at the Ni phase. The reaction layers grow with longer reaction time. Their average growth rates in the Ni/Sb and Ni/CoSb3 couples reacted for 20 h are 1.1 μm/h and 1.0 μm/h, respectively.

KW - CoSb

KW - Interfacial reaction

KW - Ni

KW - Thermoelectric

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JO - Journal of Alloys and Compounds

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