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The effect of ball-milling treatment of original powders on the sintering process and critical current density of graphite-doped MgB2 bulks

Journal Article


Abstract


  • In present study, the sintering process and superconducting properties of MgB2 prepared with milled original powders of Mg, B, and 3 at.% Graphite were investigated. It was found that ball-milling treatment of original powders can significantly promote the C substitution for B in MgB2 crystal lattice, resulting in more lattice distortion. Consequently, the values of J c at high fields were improved. Besides, ball-milling also refined MgB2 grains, which enhances grain boundary pinning and is also contributed to the improved J c at high fields. On the other hand, with the milling time prolonging, Mg becomes more active and leads to an obvious increase of MgO impurities during the subsequent sintering process. These MgO impurities would degrade the connectivity between MgB2 grains and finally lead to slight decrease in J c at low fields. © 2012 Springer Science+Business Media New York.

UOW Authors


  •   Ma, Zongqing (external author)
  •   Cai, Qi (external author)
  •   Yu, Liming (external author)
  •   Wang, Rui (external author)
  •   Dong, Zhizhong (external author)
  •   Jiang, Hua (external author)
  •   Liu, Yongchang (external author)

Publication Date


  • 2013

Citation


  • Jiang, H., Ma, Z., Liu, Y., Dong, Z., Yu, L., Cai, Q. & Wang, R. (2013). The effect of ball-milling treatment of original powders on the sintering process and critical current density of graphite-doped MgB2 bulks. Journal of Materials Science, 48 (6), 2485-2489.

Scopus Eid


  • 2-s2.0-84879552938

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1953

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 2485

End Page


  • 2489

Volume


  • 48

Issue


  • 6

Abstract


  • In present study, the sintering process and superconducting properties of MgB2 prepared with milled original powders of Mg, B, and 3 at.% Graphite were investigated. It was found that ball-milling treatment of original powders can significantly promote the C substitution for B in MgB2 crystal lattice, resulting in more lattice distortion. Consequently, the values of J c at high fields were improved. Besides, ball-milling also refined MgB2 grains, which enhances grain boundary pinning and is also contributed to the improved J c at high fields. On the other hand, with the milling time prolonging, Mg becomes more active and leads to an obvious increase of MgO impurities during the subsequent sintering process. These MgO impurities would degrade the connectivity between MgB2 grains and finally lead to slight decrease in J c at low fields. © 2012 Springer Science+Business Media New York.

UOW Authors


  •   Ma, Zongqing (external author)
  •   Cai, Qi (external author)
  •   Yu, Liming (external author)
  •   Wang, Rui (external author)
  •   Dong, Zhizhong (external author)
  •   Jiang, Hua (external author)
  •   Liu, Yongchang (external author)

Publication Date


  • 2013

Citation


  • Jiang, H., Ma, Z., Liu, Y., Dong, Z., Yu, L., Cai, Q. & Wang, R. (2013). The effect of ball-milling treatment of original powders on the sintering process and critical current density of graphite-doped MgB2 bulks. Journal of Materials Science, 48 (6), 2485-2489.

Scopus Eid


  • 2-s2.0-84879552938

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1953

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 2485

End Page


  • 2489

Volume


  • 48

Issue


  • 6