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Science in China Series A: Mathematics

, Volume 44, Issue 9, pp 1205–1208 | Cite as

Effect of Mg and C contents in MgCNi3, and structure and superconductivity of MgCNi3-x -Co x

  • Zhi’an Ren
  • Guangcan Che
  • Shunlian Jia
  • Hong Chen
  • Yongming Ni
  • Zhongxian Zhao
Article

Abstract

The effect of Mg and C contents on TC in MgCN3, and structure and superconductivity of MgCNi3-x Co x were studied. It is found that the excess of Mg and C in initial material mixture is favorable to improvement inT c and helps to obtain single-phase samples. For preparing MgCNi3 superconductor, the optimum composition of starting materials is MgC1.45Ni3 with excess of Mg (20 wt.%) of the stoichiometric composition. In gCNi3-x Co x system, a continuous solid solution is formed, lattice parameter decreases slightly andT c decreases obviously with increasingx. A suppression of superconductivity is observed due to the substitution of Co (Mn) for Ni. The suppression effect is smaller for the substitution of Co than that of Mn

Keywords

Mg-C-Ni alloy preparation structure superconductivity 

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References

  1. 1.
    Nagamatsu, J., Nakagawa, N., Muranaka, T. et al., Superconductivity at 39 K in magnesium diboride, Nature, 2001, 410: 63.CrossRefGoogle Scholar
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    He, T., Huang, Q., Ramirez, A. P. et al., Superconductivity in the non-oxide Perovskite MgCNi3, Nature, in press (cond-matter/0103296).Google Scholar
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    Villars, P., Calvent, L. D., Penon’s Handbook of Crystallographic Data for Intermetallic Phases, 2nd edition, Vol. 2, 0hio: The Materials Information Society, 1996, 1942.Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Zhi’an Ren
    • 1
  • Guangcan Che
    • 1
  • Shunlian Jia
    • 1
  • Hong Chen
    • 1
  • Yongming Ni
    • 1
  • Zhongxian Zhao
    • 1
  1. 1.National Laboratory for SuperconductivityInstitute of Physics, Chinese Academy of SciencesBeijingChina

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