Influences of material processing on the microstructure and inter-granular current properties of polycrystalline bulk Ba(Fe,Co)2As2

被引：8

作者：

Hayashi, Y. ^{[1
]}

Yamamoto, A. ^{[1
,2
]}

Ogino, H. ^{[1
]}

Shimoyama, J. ^{[1
]}

Kishio, K. ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Dept Appl Chem, Tokyo 1138656, Japan

[2] JST PRESTO, Saitama 3320012, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2014年 / 504卷

关键词：

Iron-based superconductors; Polycrystalline bulks; Microstructure; Intergranular current; CRITICAL-CURRENT DENSITY; SUPERCONDUCTOR;

D O I：

10.1016/j.physc.2014.01.010

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The phase formation, microstructure, magnetic, and transport properties of Ba(Fe,Co)(2)As-2 polycrystalline bulks prepared by systematically varied synthesis conditions were studied to clarify the key issues for intergranular critical current properties. After optimization of heat treatment process, Ba(Fe0.92Co0.08)(2)As-2 samples with high phase purity and T-c > 25 K were reproducibly obtained. Electron microscopy analyses showed that the use of refined starting powder by high-energy ball-milling yield microstructure with improved uniformity and Ba(Fe,Co)(2)As-2 phase can be synthesized at lower temperature down to 500 degrees C owing to an increased reactivity. The samples synthesized at low temperature showed well-connected microstructure with fine grain size and intergranular critical current density progressively improved with lowering the heating temperature. Our results suggest that fine grain size and grain boundary structure formed at low temperature are favorable for increasing the area of effective transport current path, while they are electromagnetically weakly coupled and suppressed under external magnetic field. (c) 2014 Elsevier B.V. All rights reserved.

引用

页码：28 / 32

页数：5

共 30 条

[1] The behavior of grain boundaries in the Fe-based superconductors [J].

Durrell, J. H. ;

Eom, C-B ;

Gurevich, A. ;

Hellstrom, E. E. ;

Tarantini, C. ;

Yamamoto, A. ;

Larbalestier, D. C. .

REPORTS ON PROGRESS IN PHYSICS, 2011, 74 (12)

[2]

Eisterer M., 2010, SUPERCOND SCI TECH, V23, P1

[3] Effective Ex-situ Fabrication of F-Doped SmFeAsO Wire for High Transport Critical Current Density [J].

Fujioka, Masaya ;

Kota, Tomohiro ;

Matoba, Masanori ;

Ozaki, Toshinori ;

Takano, Yoshihiko ;

Kumakura, Hiroaki ;

Kamihara, Yoichi .

APPLIED PHYSICS EXPRESS, 2011, 4 (06)

[4] Superconductivity in the PbO-type structure α-FeSe [J].

Hsu, Fong-Chi ;

Luo, Jiu-Yong ;

Yeh, Kuo-Wei ;

Chen, Ta-Kun ;

Huang, Tzu-Wen ;

Wu, Phillip M. ;

Lee, Yong-Chi ;

Huang, Yi-Lin ;

Chu, Yan-Yi ;

Yan, Der-Chung ;

Wu, Maw-Kuen .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2008, 105 (38) :14262-14264

[5] Epitaxial Growth of Superconducting Ba(Fe1-xCox)2As2 Thin Films on Technical Ion Beam Assisted Deposition MgO Substrates [J].

Iida, Kazumasa ;

Haenisch, Jens ;

Trommler, Sascha ;

Matias, Vladimir ;

Haindl, Silvia ;

Kurth, Fritz ;

del Pozo, Irene Lucas ;

Huehne, Ruben ;

Kidszun, Martin ;

Engelmann, Jan ;

Schultz, Ludwig ;

Holzapfel, Bernhard .

APPLIED PHYSICS EXPRESS, 2011, 4 (01)

[6] Comparative high-field magnetotransport of the oxypnictide superconductors RFeAsO1-xFx (R=La, Nd) and SmFeAsO1-δ [J].

Jaroszynski, J. ;

Riggs, Scott C. ;

Hunte, F. ;

Gurevich, A. ;

Larbalestier, D. C. ;

Boebinger, G. S. ;

Balakirev, F. F. ;

Migliori, Albert ;

Ren, Z. A. ;

Lu, W. ;

Yang, J. ;

Shen, X. L. ;

Dong, X. L. ;

Zhao, Z. X. ;

Jin, R. ;

Sefat, A. S. ;

McGuire, M. A. ;

Sales, B. C. ;

Christen, D. K. ;

Mandrus, D. .

PHYSICAL REVIEW B, 2008, 78 (06)

[7] Intergrain current flow in a randomly oriented polycrystalline SmFeAsO0.85 oxypnictide [J].

Kametani, F. ;

Li, P. ;

Abraimov, D. ;

Polyanskii, A. A. ;

Yamamoto, A. ;

Jiang, J. ;

Hellstrom, E. E. ;

Gurevich, A. ;

Larbalestier, D. C. ;

Ren, Z. A. ;

Yang, J. ;

Dong, X. L. ;

Lu, W. ;

Zhao, Z. X. .

APPLIED PHYSICS LETTERS, 2009, 95 (14)

[8] Iron-based layered superconductor La[O1-xFx]FeAs (x=0.05-0.12) with Tc=26 K [J].

Kamihara, Yoichi ;

Watanabe, Takumi ;

Hirano, Masahiro ;

Hosono, Hideo .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (11) :3296-+

[9] Advantageous grain boundaries in iron pnictide superconductors [J].

Katase, Takayoshi ;

Ishimaru, Yoshihiro ;

Tsukamoto, Akira ;

Hiramatsu, Hidenori ;

Kamiya, Toshio ;

Tanabe, Keiichi ;

Hosono, Hideo .

NATURE COMMUNICATIONS, 2011, 2

[10] High Critical Current Density 4 MA/cm2 in Co-Doped BaFe2As2 Epitaxial Films Grown on (La, Sr)(Al, Ta)O3 Substrates without Buffer Layers [J].

Katase, Takayoshi ;

Hiramatsu, Hidenori ;

Kamiya, Toshio ;

Hosono, Hideo .

APPLIED PHYSICS EXPRESS, 2010, 3 (06)

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