Original Articles |
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Structural Properties of MgB2 Superconductors with a
Critical Current Density Greater than 105A/cm2 |
LI Jian-Qi1;LI Long1,2;ZHOU Yu-Qing1;REN Zhi-An1;CHE Guang-Can1;ZHAO Zhong-Xian1
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1National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Ningxia University, Yinchuan 750021
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Cite this article: |
LI Jian-Qi, LI Long, ZHOU Yu-Qing et al 2001 Chin. Phys. Lett. 18 680-683 |
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Abstract Structural features of MgB2 superconductors prepared under different conditions have been analysed by means of transmission electron microscopy. The MgB2 crystal is identified to have a hexagonal structure with the space group of P6/mmm. Superconducting materials synthesized under a high pressure of 6 Gpa are made of regularly stacked grains as large as a few microns in sizes. Stacking faults and microstructure properties of grain boundaries either with or without impurities, appearing in a sample with the critical current density greater than 105A/cm2, have been systematically investigated.
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Keywords:
74.62.Bf
74.60.-w
61.14.Lj
61.16.Bg
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Published: 01 May 2001
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