Strongly enhanced critical current density in MgB2/Fe tapes by stearic acid and stearate doping

Zhaoshun Gao; Yanwei Ma; Xianping Zhang; Dongliang Wang; Zhengguang Yu; Kazuo Watanabe; Huan Yang; Haihu Wen

doi:10.1088/0953-2048/20/5/013

Strongly enhanced critical current density in MgB₂/Fe tapes by stearic acid and stearate doping

Zhaoshun Gao, Yanwei Ma, Xianping Zhang, Dongliang Wang, Zhengguang Yu, Kazuo Watanabe, Huan Yang, Haihu Wen

High Field Laboratory for Superconducting Materials

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

33 Citations (Scopus)

Abstract

Fe-sheathed MgB₂ tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that J_c, H_irr and H_c2 were significantly enhanced by doping. Compared to the pure tapes, J_c for all the doped samples was improved by more than an order of magnitude in a high-field regime. At 4.2K, the transport J_c reached 2.02 × 10⁴Acm^-2 at 10T for the Zn stearate doped tapes and 3.72 × 10³Acm^-2 at 14T for the stearic acid doped samples, respectively. Moreover, at 20K, H_irr for the Zn stearate doped tape achieved 10T, which is comparable to that of the commercial NbTi at 4.2K. The improvement of J_c-H properties in doped samples can be attributed to the increase of H_c2 resulting from the incorporation of C atoms into the MgB₂ crystal lattice as well as a high density of flux-pinning centres.

Original language	English
Article number	013
Pages (from-to)	485-489
Number of pages	5
Journal	Superconductor Science and Technology
Volume	20
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/20/5/013
Publication status	Published - 2007 May 1

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/20/5/013

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title = "Strongly enhanced critical current density in MgB2/Fe tapes by stearic acid and stearate doping",

abstract = "Fe-sheathed MgB2 tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that Jc, Hirr and Hc2 were significantly enhanced by doping. Compared to the pure tapes, Jc for all the doped samples was improved by more than an order of magnitude in a high-field regime. At 4.2K, the transport Jc reached 2.02 × 104Acm-2 at 10T for the Zn stearate doped tapes and 3.72 × 103Acm-2 at 14T for the stearic acid doped samples, respectively. Moreover, at 20K, Hirr for the Zn stearate doped tape achieved 10T, which is comparable to that of the commercial NbTi at 4.2K. The improvement of Jc-H properties in doped samples can be attributed to the increase of Hc2 resulting from the incorporation of C atoms into the MgB2 crystal lattice as well as a high density of flux-pinning centres.",

author = "Zhaoshun Gao and Yanwei Ma and Xianping Zhang and Dongliang Wang and Zhengguang Yu and Kazuo Watanabe and Huan Yang and Haihu Wen",

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T1 - Strongly enhanced critical current density in MgB2/Fe tapes by stearic acid and stearate doping

AU - Gao, Zhaoshun

AU - Ma, Yanwei

AU - Zhang, Xianping

AU - Wang, Dongliang

AU - Yu, Zhengguang

AU - Watanabe, Kazuo

AU - Yang, Huan

AU - Wen, Haihu

PY - 2007/5/1

Y1 - 2007/5/1

N2 - Fe-sheathed MgB2 tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that Jc, Hirr and Hc2 were significantly enhanced by doping. Compared to the pure tapes, Jc for all the doped samples was improved by more than an order of magnitude in a high-field regime. At 4.2K, the transport Jc reached 2.02 × 104Acm-2 at 10T for the Zn stearate doped tapes and 3.72 × 103Acm-2 at 14T for the stearic acid doped samples, respectively. Moreover, at 20K, Hirr for the Zn stearate doped tape achieved 10T, which is comparable to that of the commercial NbTi at 4.2K. The improvement of Jc-H properties in doped samples can be attributed to the increase of Hc2 resulting from the incorporation of C atoms into the MgB2 crystal lattice as well as a high density of flux-pinning centres.

AB - Fe-sheathed MgB2 tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that Jc, Hirr and Hc2 were significantly enhanced by doping. Compared to the pure tapes, Jc for all the doped samples was improved by more than an order of magnitude in a high-field regime. At 4.2K, the transport Jc reached 2.02 × 104Acm-2 at 10T for the Zn stearate doped tapes and 3.72 × 103Acm-2 at 14T for the stearic acid doped samples, respectively. Moreover, at 20K, Hirr for the Zn stearate doped tape achieved 10T, which is comparable to that of the commercial NbTi at 4.2K. The improvement of Jc-H properties in doped samples can be attributed to the increase of Hc2 resulting from the incorporation of C atoms into the MgB2 crystal lattice as well as a high density of flux-pinning centres.

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Strongly enhanced critical current density in MgB₂/Fe tapes by stearic acid and stearate doping

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