High critical current density of MgB2 bulk superconductor doped with Ti and sintered at ambient pressure

Y. Zhao; Y. Feng; C. H. Cheng; L. Zhou; Y. Wu; T. Machi; Y. Fudamoto; N. Koshizuka; M. Murakami

doi:10.1063/1.1396629

High critical current density of MgB₂ bulk superconductor doped with Ti and sintered at ambient pressure

Y. Zhao
, Y. Feng
, C. H. Cheng
, L. Zhou
, Y. Wu
, T. Machi
, Y. Fudamoto
, N. Koshizuka
, M. Murakami

International Superconductivity Technology Center
University of New South Wales
Northwest Institute for Nonferrous Metal Research

科研成果: 期刊稿件 › 文章 › 同行评审

214 引用（Scopus）

摘要

Ti-doped MgB₂ superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. The density, diamagnetic signal, and J_c of the samples change significantly with the doping level, with the best result achieved at cursive chi = 0.1. At 5 K, the J_c reaches 2 × 10⁶ A/cm² in the self-field and 5 × 10⁴ A/cm² in 5 T. At 20 K, the J_c is still as high as 1.3 × 10⁶ A/cm² in the self-field and 9.4 × 10⁴ A/cm² in 2 T. It is observed that partial melting occurs in the Ti-doped samples, resulting in an excellent grain connection and extremely high density. In addition, some fine particles (with sizes from 10 to 100 nm) of the second phases induced by Ti doping are distributed in the MgB₂ matrix, and this may play an important role in flux pinning enhancement.

源语言	英语
页（从-至）	1154-1156
页数	3
期刊	Applied Physics Letters
卷	79
期	8
DOI	https://doi.org/10.1063/1.1396629
出版状态	已出版 - 20 8月 2001
已对外发布	是

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title = "High critical current density of MgB2 bulk superconductor doped with Ti and sintered at ambient pressure",

abstract = "Ti-doped MgB2 superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. The density, diamagnetic signal, and Jc of the samples change significantly with the doping level, with the best result achieved at cursive chi = 0.1. At 5 K, the Jc reaches 2 × 106 A/cm2 in the self-field and 5 × 104 A/cm2 in 5 T. At 20 K, the Jc is still as high as 1.3 × 106 A/cm2 in the self-field and 9.4 × 104 A/cm2 in 2 T. It is observed that partial melting occurs in the Ti-doped samples, resulting in an excellent grain connection and extremely high density. In addition, some fine particles (with sizes from 10 to 100 nm) of the second phases induced by Ti doping are distributed in the MgB2 matrix, and this may play an important role in flux pinning enhancement.",

author = "Y. Zhao and Y. Feng and Cheng, \{C. H.\} and L. Zhou and Y. Wu and T. Machi and Y. Fudamoto and N. Koshizuka and M. Murakami",

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T1 - High critical current density of MgB2 bulk superconductor doped with Ti and sintered at ambient pressure

AU - Zhao, Y.

AU - Feng, Y.

AU - Cheng, C. H.

AU - Zhou, L.

AU - Wu, Y.

AU - Machi, T.

AU - Fudamoto, Y.

AU - Koshizuka, N.

AU - Murakami, M.

PY - 2001/8/20

Y1 - 2001/8/20

N2 - Ti-doped MgB2 superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. The density, diamagnetic signal, and Jc of the samples change significantly with the doping level, with the best result achieved at cursive chi = 0.1. At 5 K, the Jc reaches 2 × 106 A/cm2 in the self-field and 5 × 104 A/cm2 in 5 T. At 20 K, the Jc is still as high as 1.3 × 106 A/cm2 in the self-field and 9.4 × 104 A/cm2 in 2 T. It is observed that partial melting occurs in the Ti-doped samples, resulting in an excellent grain connection and extremely high density. In addition, some fine particles (with sizes from 10 to 100 nm) of the second phases induced by Ti doping are distributed in the MgB2 matrix, and this may play an important role in flux pinning enhancement.

AB - Ti-doped MgB2 superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. The density, diamagnetic signal, and Jc of the samples change significantly with the doping level, with the best result achieved at cursive chi = 0.1. At 5 K, the Jc reaches 2 × 106 A/cm2 in the self-field and 5 × 104 A/cm2 in 5 T. At 20 K, the Jc is still as high as 1.3 × 106 A/cm2 in the self-field and 9.4 × 104 A/cm2 in 2 T. It is observed that partial melting occurs in the Ti-doped samples, resulting in an excellent grain connection and extremely high density. In addition, some fine particles (with sizes from 10 to 100 nm) of the second phases induced by Ti doping are distributed in the MgB2 matrix, and this may play an important role in flux pinning enhancement.

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High critical current density of MgB2 bulk superconductor doped with Ti and sintered at ambient pressure

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High critical current density of MgB₂ bulk superconductor doped with Ti and sintered at ambient pressure