中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1421-1424.doi: 10.1088/1674-1056/17/4/045

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Synthesis of superconductor MgCNi3 with carbon nanotubes

夏庆林, 易健宏, 彭元东, 罗述东, 王红忠, 李丽娅   

  1. School of Physical Science and Technology and State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
  • 收稿日期:2007-10-19 修回日期:2007-12-28 出版日期:2008-04-20 发布日期:2008-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60571043).

Synthesis of superconductor MgCNi3 with carbon nanotubes

Xia Qing-Lin(夏庆林)†, Yi Jian-Hong(易健宏), Peng Yuan-Dong(彭元东), Luo Shu-Dong(罗述东), Wang Hong-Zhong(王红忠), and Li Li-Ya(李丽娅)   

  1. School of Physical Science and Technology and State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
  • Received:2007-10-19 Revised:2007-12-28 Online:2008-04-20 Published:2008-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60571043).

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摘要： MgCNi3, an intermetallic compound superconductor with a cubic perovskite crystal structure, has been synthesized using fine Mg and Ni powders and carbon nanotubes (CNTs) as starting materials by the conventional powder metallurgy method. The composition, microstructure and superconductivity are characterized using x-ray diffraction (XRD), energy dispersive x-ray (EDX) analysis, scanning electron microscopy (SEM), and superconducting quantum interference device (SQUID) magnetometer. The results indicate that the phases of the synthesized samples are MgCNi3 (major phase) and traces of C and MgO. The MgCNi3 particle sizes range from several hundreds of nanometres to several micrometres. The onset superconducting transition temperature Tc of the MgCNi3 sample is about 7.2\,K. The critical current density Jc is about 3.44×104A/cm2 calculated according to the Bean model from the magnetization hysteresis loop of the slab MgCNi3 sample at 5K and zero applied field.

关键词: MgCNi3 superconductor, synthesis, carbon nanotubes

Abstract: MgCNi3, an intermetallic compound superconductor with a cubic perovskite crystal structure, has been synthesized using fine Mg and Ni powders and carbon nanotubes (CNTs) as starting materials by the conventional powder metallurgy method. The composition, microstructure and superconductivity are characterized using x-ray diffraction (XRD), energy dispersive x-ray (EDX) analysis, scanning electron microscopy (SEM), and superconducting quantum interference device (SQUID) magnetometer. The results indicate that the phases of the synthesized samples are MgCNi3 (major phase) and traces of C and MgO. The MgCNi3 particle sizes range from several hundreds of nanometres to several micrometres. The onset superconducting transition temperature Tc of the MgCNi3 sample is about 7.2 K. The critical current density Jc is about 3.44×104A/cm2 calculated according to the Bean model from the magnetization hysteresis loop of the slab MgCNi3 sample at 5K and zero applied field.

Key words: MgCNi3 superconductor, synthesis, carbon nanotubes

中图分类号: 

  • 74.25.Fy
74.25.Sv (Critical currents) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 82.80.Ej (X-ray, M?ssbauer, and other γ-ray spectroscopic analysis methods) 85.25.Dq (Superconducting quantum interference devices (SQUIDs))