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Improved critical current densities in MgB2 tapes fabricated through an ex situ process using powders treated in various chemical solutions

Published online by Cambridge University Press:  31 January 2011

H. Fujii ,
K. Togano  and
K. Ozawa
H. Fujii*
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
K. Togano
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
K. Ozawa
Affiliation:
Photocatalytic Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
a) Address all correspondence to this author. e-mail: fujii.hiroki@nims.go.jp
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Abstract

We have studied grain coupling and critical current density (Jc) in ex situ processed Fe-sheathed MgB2 tapes fabricated by a powder-in-tube (PIT) technique, using MgB2 powder soaked in various chemical solutions. The grain coupling and the Jc are strongly influenced by the chemical solutions. Compared with the chemical treatment in a benzene solution of benzoic acid, the use of a cyclohexane solution of benzoic acid doubles the Jc value. Cyclohexane is less stable and hence effectively removed from the surface of MgB2 grains, bringing about the improved coupling of grains and the Jc enhancement.

Keywords

SuperconductingMicrostructureGrain size
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 507 - 514
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

1Nagamatsu, J., Nakagawa, N., Muranaka, T., Zenitani, Y.Akimitsu, J.: Superconductivity at 39 K in magnesium diboride. Nature 410, 63 2001CrossRefGoogle ScholarPubMed
2Jin, S., Mavoori, H.van Dover, R.B.: High critical currents in iron-clad superconducting MgB2 wires. Nature 411, 563 2001CrossRefGoogle ScholarPubMed
3Suo, H.L., Beneduce, C., Dhallé, M., Musolino, N., Genoud, J-Y.Flükiger, R.: Large transport critical currents in dense Fe- and Ni-clad MgB2 superconducting tapes. Appl. Phys. Lett. 79, 3116 2001CrossRefGoogle Scholar
4Fujii, H., Kumakura, H.Togano, K.: Improved critical current in MgB2 tapes sheathed with carbon steels. J. Mater. Res. 17, 2339 2002CrossRefGoogle Scholar
5Fujii, H., Togano, K.Kumakura, H.: Enhancement of critical current densities of powder-in-tube processed MgB2 tapes by using MgH2 as a precursor powder. Supercond. Sci. Technol. 15, 1571 2002CrossRefGoogle Scholar
6Fujii, H., Togano, K.Kumakura, H.: Fabrication of MgB2 tapes sheathed with carbon steels by ex situ and in situ methods. IEEE Trans. Appl. Supercond. 13(2), 3217 2003CrossRefGoogle Scholar
7Yamada, H., Hirakawa, M., Kumakura, H., Matsumoto, A.Kitaguchi, H.: Critical current densities of powder-in-tube MgB2 tapes fabricated with nanometer-size Mg powder. Appl. Phys. Lett. 84, 1728 2004CrossRefGoogle Scholar
8Yamada, H., Hirakawa, M., Kumakura, H.Kitaguchi, H.: Effect of aromatic hydrocarbon addition on in situ powder-in-tube processed MgB2 tapes. Supercond. Sci. Technol. 19, 175 2006CrossRefGoogle Scholar
9Fujii, H., Kumakura, H.Togano, K.: Influence of MgB2 powder quality on the transport properties of Cu-sheathed MgB2 tapes. Physica C 363, 237 2001CrossRefGoogle Scholar
10Nakane, T., Kitaguchi, H.Kumakura, H.: Improvement in the critical current density of ex situ powder in tube processed MgB2 tapes by utilizing powder prepared from an in situ processed tape. Appl. Phys. Lett. 88, 022513 2006CrossRefGoogle Scholar
11Fang, H., Padmanabhan, S., Zhou, Y.X.Salama, K.: High critical current density in iron-clad MgB2 tapes. Appl. Phys. Lett. 82, 4113 2003CrossRefGoogle Scholar
12Fisher, C., Rodig, C., Hassler, W., Perner, O., Eckert, J., Nenkov, K., Fuchs, G., Wendrock, H., Holzapfel, B.Schultz, L.: Preparation of MgB2 tapes using a nanocrystalline partially reacted precursor. Appl. Phys. Lett. 83, 1803 2003CrossRefGoogle Scholar
13Fujii, H., Togano, K.Ozawa, K.: Improved critical current densities in ex-situ processed MgB2 tapes fabricated with chemically treated powder. J. Mater. Res. 22, 1281 2007CrossRefGoogle Scholar
14Masui, T., Lee, S.Tajima, S.: Carbon-substitution effect on the electronic properties of MgB2 single crystals. Phys. Rev. B 70, 024504 2004CrossRefGoogle Scholar
15Wilke, R.H.T., Bud’ko, S.L., Canfield, P.C., Finnemore, D.K., Suplinskas, R.J.Hannahs, S.T.: Systematic effects of carbon doping on the superconducting properties of Mg(B1−xCx)2. Phys. Rev. Lett. 92, 217003 2004CrossRefGoogle ScholarPubMed
16Handbook of Chemistry,, Basic II 5th ed. (The Chemical Society of Japan, Tokyo, in Japanese) 340Google Scholar
17Dou, S.X., Soltanian, S., Horvat, J., Wang, X.L., Zhou, S.H., Ionescu, M., Liu, H.K., Monroe, P.Tomsic, M.: Enhancements of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SiC doping. Appl. Phys. Lett. 81, 3419 2002CrossRefGoogle Scholar
18Bean, C.P.: Magnetization of high-field superconductors. Rev. Mod. Phys. 36, 31 1964CrossRefGoogle Scholar
19Fujii, H., Togano, K., Kumakura, H.Ozawa, K.: Effect of SiC addition on the superconducting properties of MgB2 tapes fabricated through an ex-situ process using chemically treated powder. Supercond. Sci. Technol. 20, 579 2007CrossRefGoogle Scholar
20Takenobu, T., Ito, T., Chi, D.H., Prassides, K.Iwasa, Y.: Intralayer carbon substitution in the MgB2 superconductor. Phys. Rev. B 64, 134513 2001CrossRefGoogle Scholar
21Bharathi, A., Balaselvi, S.J., Kalavathi, S., Reddy, G.L.N., Sastry, V.S., Hariharan, Y.Radhakrishnan, T.S.: Carbon solubility and superconductivity in MgB2. Physica C 370, 211 2002CrossRefGoogle Scholar
22Lee, S., Masui, T., Yamamoto, A., Uchiyama, H.Tajima, S.: Carbon-substituted MgB2 single crystals. Physica C 397, 7 2003CrossRefGoogle Scholar
23Fujii, H., Togano, K.Ozawa, K.: Effects of both addition and chemical treatment of SiC nanoparticles on the grain coupling and the critical current density in ex-situ processed MgB2 tapes using chemically treated MgB2 powder. Supercond. Sci. Technol. 21, 015002 2008CrossRefGoogle Scholar
24Grasso, G., Malagoli, A., Ferdeghini, C., Roncallo, S., Braccini, V., Siri, A.S.Cimberle, M.R.: Large transport critical currents in unsintered MgB2 superconducting tapes. Appl. Phys. Lett. 79, 230 2001CrossRefGoogle Scholar