An interface diffusion process approach for the fabrication of MgB<sub>2</sub>wire

Togano, K.; Nakane, T.; Fujii, Hiroki; Takeya, Hiroyuki; Kumakura, Hiroaki

doi:10.1088/0953-2048/19/6/l01

Cited by 36 publications

(18 citation statements)

References 11 publications

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“…Diffusion method was also used for the synthesis of MgB 2 tapes. Togano et al fabricated a B/Fe-Mg composite tape and obtained a high-density MgB 2 layer by the diffusion reaction between the B plate and a Fe-Mg alloy sheet [26].…”

Section: Diffusion Methodsmentioning

confidence: 99%

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Ranot

Kang

2012

Current Applied Physics

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The MgB 2 coated superconducting tapes have been fabricated on textured Cu (0 0 1) and polycrystalline Hastelloy tapes using coated conductor technique, which has been developed for the second generation high temperature superconducting wires. The MgB 2 /Cu tapes were fabricated over a wide temperature range of 460-520 °C by using hybrid physical-chemical vapor deposition (HPCVD) technique. The tapes exhibited the critical temperatures (T c ) ranging between 36 and 38 K with superconducting transition width (∆T c ) of about 0.3-0.6 K. The highest critical current density (J c ) of 1.34 × 10 5 A/cm 2 at 5 K under 3 T is obtained for the MgB 2 /Cu tape grown at 460 ºC. To further improve the flux pinning property of MgB 2 tapes, SiC is coated as an impurity layer on the Cu tape. In contrast to pure MgB 2 /Cu tapes, the MgB 2 on SiC-coated Cu tapes exhibited opposite trend in the dependence of J c with growth temperature. The improved flux pinning by the additional defects created by SiC-impurity layer along with the MgB 2 grain boundaries lead to strong improvement in J c for the MgB 2 /SiC/Cu tapes. The MgB 2 /Hastelloy superconducting tapes fabricated at a temperature of 520 °C showed the critical temperatures ranging between 38.5 and 39.6 K. We obtained much higher J c values over the wide field range for MgB 2 /Hastelloy tapes than the previously reported data on other metallic substrates, such as Cu, SS, and Nb. The J c values of J c (20 K, 0 T) ~5.8 × 10 6 A/cm 2 and J c (20 K, 1.5 T) ~2.4 × 10 5 A/cm 2 is obtained for the 2-µm-thick MgB 2 /Hastelloy tape. This paper will review the merits of coated conductor approach along with the HPCVD technique to fabricate MgB 2 conductors with high T c and J c values which are useful for large scale applications.

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Section: Diffusion Methodsmentioning

confidence: 99%

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Ranot

Kang

2012

Current Applied Physics

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“…To achieve much less MgO secondary phase, as well as highly dense structure in MgB 2 conductors, an interface diffusion process was proposed by Togano et al (Togano et al, 2006). The conductors were fabricated from an interface diffusive reaction between an FeMg alloy substrate and B at 950 ºC for 12 hours.…”

Section: Mg Diffusion Methodsmentioning

confidence: 99%

Structural Characteristic and Superconducting Performance of MgB2 Fabricated by Mg Diffusion Process

Maeda¹,

Kim²,

Dou³

2012

Superconductors - Properties, Technology, and Applications

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“…For the commercial use of MgB 2 superconductors to the magnet applications, the long length MgB 2 wires with a high T c and J c should be fabricated. The superconducting properties of MgB 2 are fairly dependent on the fabrication process [20][21][22][23]. To improve the J c of the in situ processed MgB 2 , processing parameters such as initial size and composition of raw materials, a type of dopants, and reaction temperature should be optimized.…”

Section: Introductionmentioning

confidence: 99%

T_cand J_cdistribution in in situ processed MgB₂bulk superconductors with/without C doping

Kim¹,

Kim²,

Lim³

et al. 2014

Progress in Superconductivity and Cryogenics

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Temperature dependence of magnetic moment (m−T) and the magnetization (M− ) at 5 K and 20 K of the in situ processed MgB 2 bulk pellets with/without carbon (C) doping were examined. The superconducting critical temperature (T c ), the superconducting transition width (∆T) and the critical current density (J c ) were estimated for ten test samples taken from the MgB 2 bulk pellets. The reliable m−T characteristics associated with the uniform MgB 2 formation were obtained for both MgB 2 pellets. The T c s and ∆Ts of all test samples of the undoped MgB 2 were the same each other as 37.5 K and 1.5 K, respectively. The T c s and ∆Ts of the C-doped MgB 2 were 36.5 K and 2.5 K, respectively. Unlike the m−T characteristics, there existed the difference among the M−H curves of the test samples, which might be caused by the microstructure variation. In spite of the slight T c decrease, the C doping was effective in enhancing the J c at 5 K.

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An interface diffusion process approach for the fabrication of MgB₂wire

Cited by 36 publications

References 11 publications

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Structural Characteristic and Superconducting Performance of MgB2 Fabricated by Mg Diffusion Process

T_cand J_cdistribution in in situ processed MgB₂bulk superconductors with/without C doping

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An interface diffusion process approach for the fabrication of MgB2wire

Cited by 36 publications

References 11 publications

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical–chemical vapor deposition

Structural Characteristic and Superconducting Performance of MgB2 Fabricated by Mg Diffusion Process

Tcand Jcdistribution in in situ processed MgB2bulk superconductors with/without C doping

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An interface diffusion process approach for the fabrication of MgB₂wire

T_cand J_cdistribution in in situ processed MgB₂bulk superconductors with/without C doping