Enhancement of the upper critical field in sub-micron carbon-doped MgB 2 by two-step reaction method

S. C. Yan; G. Yan; L. Zhou; Y. Jia; H. H. Wen; Y. F. Lu

doi:10.1088/0953-2048/20/4/012

Enhancement of the upper critical field in sub-micron carbon-doped MgB ₂ by two-step reaction method

S. C. Yan, G. Yan, L. Zhou, Y. Jia, H. H. Wen, Y. F. Lu

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

The two-step reaction method was proposed to prepare sub-micron carbon-doped MgB₂ superconductors. The sample with a nominal composition of Mg(B_0.95C_0.05)₄ was sintered at 1000 °C for 0.5h. An appropriate amount of Mg was then added to get the stoichiometry of Mg(B_0.95C_0.05)₂, which was sintered at 750 °C for 2h. The upper critical field of H_c2 for the sub-micron carbon-doped MgB₂ by a two-step reaction reached 10.5T at 20K. The critical current density J_c is 7.8 × 10 ⁴Acm^-2 at 20K and 1T. The results indicate that the two-step reaction method could effectively introduce the doping element of carbon into the MgB₂ crystalline lattice, and therefore improve the upper critical field.

Original language	English
Article number	012
Pages (from-to)	377-380
Number of pages	4
Journal	Superconductor Science and Technology
Volume	20
Issue number	4
DOIs	https://doi.org/10.1088/0953-2048/20/4/012
State	Published - 1 Apr 2007

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title = "Enhancement of the upper critical field in sub-micron carbon-doped MgB 2 by two-step reaction method",

abstract = "The two-step reaction method was proposed to prepare sub-micron carbon-doped MgB2 superconductors. The sample with a nominal composition of Mg(B0.95C0.05)4 was sintered at 1000 °C for 0.5h. An appropriate amount of Mg was then added to get the stoichiometry of Mg(B0.95C0.05)2, which was sintered at 750 °C for 2h. The upper critical field of Hc2 for the sub-micron carbon-doped MgB2 by a two-step reaction reached 10.5T at 20K. The critical current density Jc is 7.8 × 10 4Acm-2 at 20K and 1T. The results indicate that the two-step reaction method could effectively introduce the doping element of carbon into the MgB2 crystalline lattice, and therefore improve the upper critical field.",

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T1 - Enhancement of the upper critical field in sub-micron carbon-doped MgB 2 by two-step reaction method

AU - Yan, S. C.

AU - Yan, G.

AU - Zhou, L.

AU - Jia, Y.

AU - Wen, H. H.

AU - Lu, Y. F.

PY - 2007/4/1

Y1 - 2007/4/1

N2 - The two-step reaction method was proposed to prepare sub-micron carbon-doped MgB2 superconductors. The sample with a nominal composition of Mg(B0.95C0.05)4 was sintered at 1000 °C for 0.5h. An appropriate amount of Mg was then added to get the stoichiometry of Mg(B0.95C0.05)2, which was sintered at 750 °C for 2h. The upper critical field of Hc2 for the sub-micron carbon-doped MgB2 by a two-step reaction reached 10.5T at 20K. The critical current density Jc is 7.8 × 10 4Acm-2 at 20K and 1T. The results indicate that the two-step reaction method could effectively introduce the doping element of carbon into the MgB2 crystalline lattice, and therefore improve the upper critical field.

AB - The two-step reaction method was proposed to prepare sub-micron carbon-doped MgB2 superconductors. The sample with a nominal composition of Mg(B0.95C0.05)4 was sintered at 1000 °C for 0.5h. An appropriate amount of Mg was then added to get the stoichiometry of Mg(B0.95C0.05)2, which was sintered at 750 °C for 2h. The upper critical field of Hc2 for the sub-micron carbon-doped MgB2 by a two-step reaction reached 10.5T at 20K. The critical current density Jc is 7.8 × 10 4Acm-2 at 20K and 1T. The results indicate that the two-step reaction method could effectively introduce the doping element of carbon into the MgB2 crystalline lattice, and therefore improve the upper critical field.

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Enhancement of the upper critical field in sub-micron carbon-doped MgB ₂ by two-step reaction method

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