Influence of Different Mg/B Stoichiometry on Superconductivity and Flux Pinning Properties of MgB2 Bulks

被引：0

作者：

Li Fei ^{[1
]}

Pan Xifeng

Cheng, C. H. ^{[2
]}

Zhou Jiedi

Yang Ye

Zhao Yong ^{[2
]}

机构：

[1] SW Jiaotong Univ, Superconduct R&D Ctr SRDC, Key Lab Magnet Levitat Technol & Maglev Trains, Minist Educ, Chengdu 610031, Peoples R China

[2] Univ New S Wales, Sydney, NSW 2052, Australia

来源：

RARE METAL MATERIALS AND ENGINEERING | 2011年 / 40卷 / 05期

关键词：

MgB2; critical current density; flux pinning;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of MgxB2 (x=0.9, 0.95, 1.0, 1.05, 1.10) bulks samples were prepared by the in-situ solid-state reaction method, and then the effects of Mg/B stoichiometry on superconductivity and flux pinning properties of MgB2 were discussed. Phase purity, microstructure and superconducting properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and magnetic properties measurement system (MPMS), respectively. The results show that the sample with a nominal composition, Mg0.95B2 has the highest J(c) value among all the samples. In the Mg-deficient MgB2, the degraded grains grow and lack of Mg sites are responsible to significant enhancement of the H-irr and H-c2 and the enlarged Delta T-c and FWHM, resulting in the great improvement of flux pinning properties of MgB2.

引用

页码：863 / 866

页数：4

共 8 条

[1] Superior high-field current density in slightly Mg-deficient MgB2 tapes -: art. no. 252505
Jiang, CH
Nakane, T
Kumakura, H
[J]. APPLIED PHYSICS LETTERS, 2005, 87 (25) : 1 - 3
[2] Influence of boron powder purification on the connectivity of bulk MgB2
Jiang, J.
Senkowicz, B. J.
Larbalestier, D. C.
Hellstrom, E. E.
[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2006, 19 (08): : L33 - L36
[3] Flux pinning properties of B-rich and SiGdoped MgB2 tapes prepared by in situ PIT two-stage heat-treatment process
Miura, O.
Saeki, A.
Tomioka, H.
Ito, D.
Harada, N.
[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2007, 463 (812-816): : 812 - 816
[4] Superconductivity at 39 K in magnesium diboride
Nagamatsu, J
Nakagawa, N
Muranaka, T
Zenitani, Y
Akimitsu, J
[J]. NATURE, 2001, 410 (6824) : 63 - 64
[5] Influence of the cooling rate on the main factors affecting current-carrying ability in pure and SiC-doped MgB2 superconductors
Shcherbakova, O. V.
Pan, A. V.
Soltanian, S.
Dou, S. X.
Wexler, D.
[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2007, 20 (01): : 5 - 10
[6] WANGDONGLIANG, 2007, SUPERCOND SCI TECH, V20, P574
[7] Effect of starting composition and annealing temperature on irreversibility field and critical current density in MgxB2
Xu, GJ
Pinholt, R
Bilde-Sorensen, J
Grivel, JC
Abrahamsen, AB
Andersen, NH
[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2006, 434 (01): : 67 - 70
[8] ZENG R, 2005, APPL PHYS LETT, V87, P182

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