| Original Articles |
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Preparation and Characterization of the New Superconductor
MgB2
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| SUN Yu-Ping1;SONG Wen-Hai1;DAI Jian-Ming1;WU Xing-Cai1;WANG Kai-You1;ZHAO Bing1;XIAO Hong1;DU Jia-Ju1;WEN Hai-Hu2;ZHAO Zhong-Xian2 |
| 1Laboratory of Internal Friction and Defects in Solids, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 and National High Magnetic Field Laboratory, Hefei 230031
2National Laboratory for Superconductivity, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
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| Cite this article: |
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SUN Yu-Ping, SONG Wen-Hai, DAI Jian-Ming et al 2001 Chin. Phys. Lett. 18 587-588 |
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Abstract Polycrystalline samples of the new superconductor MgB2 are prepared by solid state reaction using Mg and B powders. The resistance measurement shows that the onset transition temperature and zero resistance transition temperature are Tonsetc = 43.8 K and Tc0 = 37 K, respectively. The Tc0 depends on measuring current strongly. The diamagnetic transition temperature of ～38 K is obtained by the ac susceptibility measurement. X-ray powder diffraction spectra of MgB2 can be indexed using hexagonal structure with space group P6/mmm and lattice parameters a=0.30864 and c=0.35212 nm. A second phase, probably MgO, is also found.
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| Keywords:
74.70.Ad
74.62.Bf
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Published: 01 April 2001
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| PACS: |
74.70.Ad
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(Metals; alloys and binary compounds)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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