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The Effect of Sheath Materials on the Superconductivity of MgB2

Published online by Cambridge University Press:  18 March 2011

W. Zhu ,
D. R. Watson  and
J. R. Cave
W. Zhu
Affiliation:
IREQ, Hydro Québec, v1800 Lionel Boulet Varennes, Québec, J3X 1S1, Canada
D. R. Watson
Affiliation:
IREQ, Hydro Québec, v1800 Lionel Boulet Varennes, Québec, J3X 1S1, Canada
J. R. Cave
Affiliation:
IREQ, Hydro Québec, v1800 Lionel Boulet Varennes, Québec, J3X 1S1, Canada
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Abstract

Inconel, tantalum and a silver-palladium alloy were used to fabricate MgB2tapes. The tapes, made by the Powder In Tube (PIT) method, were heat-treated at 800°C and 900°C in 1 atmosphere of flowing argon. The microstructure and phase composition of the tapes were examined by Scanning Electron Microscopy (SEM) and X-Ray Diffractometry (XRD). Critical temperatures (Tc) and magnetization-applied magnetic field (M-H) curves were measured by SQUID magnetometry. It is found that between 800–900°C inconel and tantalum sheaths have no effect on the Tc,inductive of the material. However, under certain processing conditions, the silver-palladium sheath can decrease the Tcor destroy the superconductivity completely. The inconel sheathed tape was found to have better superconducting properties than the tantalum and silver-palladium sheathed tapes. Consistency checks have been applied to verify the validity of the Bean Model in obtaining the critical current density (Jc) from magnetization data. The inconel sheathed tape is estimated to have a magnetization Jc(5K, ∼0.5 T) of 1.4 × 105A/cm2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 689: Symposium E – Materials for High-Temperature Superconductor Technologies , 2001 , E5.7
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

1 Jin, S., Mavoori, H., Bower, C., van Dover, R. B., “High critical currents in iron-clad superconducting MgB2 wires”, Nature, 411 (6837) 563 (2001).Google Scholar
2 Glowacki, B. A., Majoros, M., Vickers, M., Evetts, J. E., Shi, Y., McDougall, I., “Superconductivity of powder-in-tube MgB2 wires”, Supercond. Sci. Technol. 14 (3) 193 (2001).Google Scholar
3 Goldacker, W., Schlachter, S I, Zimmer, S and Reiner, H, “High transport currents in mechanically reinforced MgB2 wires”, Supercond. Sci. Technol. 14 (9) 787 (2001).Google Scholar
4 Jung, C.U., Park, M.-S., Kang, W. N., Kin, M.-S., Kim, K. H. P., Lee, S. Y., Lee, S.-I., “Effect of sintering temperature under high pressure on the superconductivity of MgB2 ”, Appl. Phys. Lett. 78 (26).4157 (2001).Google Scholar
5 Takano, Y., Takeya, H., Fujii, H., Kumakura, H., Hatano, T., Togano, K., Kito, H., Ihara, H., “Superconducting properties of MgB2 bulk materials prepared by high-pressure sintering”, Appl. Phys. Lett. 78 (19) 2914 (2001).Google Scholar
6 Cave, J.R., “Susceptibility and magnetization characterization of bulk high Tc superconductors: scaling length and curitical current densities”, Supercond. Sci. Technol. 5 S399 (1992).Google Scholar
7 Hautanen, K.E., Oussena, M. and Cave, J.R., “Detailed analysis of magnetization data and transport critical current measurements for Ag-(Bi,Pb)SrCaCuO composite tapes”, Cryogenics 33 (3) 326 (1993).Google Scholar
8 Yamafuji, K. and Mawatari, Y., “Estimation of critical current densities from magnetization measurements in a single crystal of a high Tc superconductor, 1.One-dimensional flux penetration”, Supercond. Sci. Technol. 5 S204 (1992).Google Scholar