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Preferential growth of boron layer in magnesium diboride (MgB2) by Mg diffusion method

Journal Article


Abstract


  • Growth mechanism and grain boundary (GB) contact of polycrystalline MgB 2 fabricated by Mg diffusion method are studied by STEM and EELS analyses. In contrast to the previous reports based on the computational calculation, preferential growth of (001) boron (B) layer and the B-B contact at MgB 2 GBs are confirmed by annular dark field (ADF) ┬┐STEM image and the combined EELS analyses. The effect of B-B contact at the GB on the superconductivity is further evaluated using First principles calculation. Superior GB linkage of the supercurrent flow via GB B-B contact is expected from the calculated density of states at Fermi level. B-terminated growth mechanism in Mg diffusion method and the effect of GB connectivity via B-B and Mg-Mg contacts are discussed. Finally, we suggest a model of GB linkage of supercurrent flow via B-B contact in polycrystalline MgB 2 .

Authors


  •   Heo, Yoon-Uk (external author)
  •   Yoon, Sangmoon (external author)
  •   Kim, Jung Ho
  •   Kim, Young-Ki (external author)
  •   Kim, Miyoung (external author)
  •   Song, Tae-Jin (external author)
  •   Maeda, Minoru (external author)
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Heo, Y., Yoon, S., Kim, J., Kim, Y., Kim, M., Song, T., Maeda, M. & Dou, S. Xue. (2017). Preferential growth of boron layer in magnesium diboride (MgB2) by Mg diffusion method. Journal of Alloys and Compounds, 725 526-535.

Scopus Eid


  • 2-s2.0-85025436787

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2647

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 526

End Page


  • 535

Volume


  • 725

Place Of Publication


  • Netherlands

Abstract


  • Growth mechanism and grain boundary (GB) contact of polycrystalline MgB 2 fabricated by Mg diffusion method are studied by STEM and EELS analyses. In contrast to the previous reports based on the computational calculation, preferential growth of (001) boron (B) layer and the B-B contact at MgB 2 GBs are confirmed by annular dark field (ADF) ┬┐STEM image and the combined EELS analyses. The effect of B-B contact at the GB on the superconductivity is further evaluated using First principles calculation. Superior GB linkage of the supercurrent flow via GB B-B contact is expected from the calculated density of states at Fermi level. B-terminated growth mechanism in Mg diffusion method and the effect of GB connectivity via B-B and Mg-Mg contacts are discussed. Finally, we suggest a model of GB linkage of supercurrent flow via B-B contact in polycrystalline MgB 2 .

Authors


  •   Heo, Yoon-Uk (external author)
  •   Yoon, Sangmoon (external author)
  •   Kim, Jung Ho
  •   Kim, Young-Ki (external author)
  •   Kim, Miyoung (external author)
  •   Song, Tae-Jin (external author)
  •   Maeda, Minoru (external author)
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Heo, Y., Yoon, S., Kim, J., Kim, Y., Kim, M., Song, T., Maeda, M. & Dou, S. Xue. (2017). Preferential growth of boron layer in magnesium diboride (MgB2) by Mg diffusion method. Journal of Alloys and Compounds, 725 526-535.

Scopus Eid


  • 2-s2.0-85025436787

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2647

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 526

End Page


  • 535

Volume


  • 725

Place Of Publication


  • Netherlands