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

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Abstract

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.

Original language	English
Pages (from-to)	1154-1156
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	8
DOIs	https://doi.org/10.1063/1.1396629
Publication status	Published - 2001 Aug 20

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ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Cite this

Zhao, Y., Feng, Y., Cheng, C. H., Zhou, L., Wu, Y., Machi, T., Fudamoto, Y., Koshizuka, N., & Murakami, M. (2001). High critical current density of MgB₂ bulk superconductor doped with Ti and sintered at ambient pressure. Applied Physics Letters, 79(8), 1154-1156. https://doi.org/10.1063/1.1396629

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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.",

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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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10.1063/1.1396629