Title

Significant enhancement of Hc2 and Hirr in MgB 2+C4H6O5 bulks at a low sintering temperature of 600 C

RIS ID

21785

Publication Details

Hossain, M., Kim, J., Xu, X., Wang, X., Rindfleisch, M., Tomic, M., Sumption, M., Collings, E. & Dou, S. X. (2007). Significant enhancement of Hc2 and Hirr in MgB 2+C4H6O5 bulks at a low sintering temperature of 600 C. Superconductor Science and Technology, 20 (8), L51-L54.

Abstract

We report the carbon (C) substitution effects of MgB2 + 10 wt% C4H6O5 (malic acid) on the lattice parameters, critical temperature (T-c), upper critical field (H-c2), and irreversibility field (H-irr) as a function of sintering temperature in the range from 600 to 900 degrees C. The additive C4H6O5 as the C source resulted in a small depression in T-c, but significantly increased the C substitution level, and hence improved the H-c2 and H-irr performance at a low sintering temperature of 600 degrees C in conjunction with a short sintering period of 4 h. In addition, the low-temperature sintering process resulted in small grain size and higher impurity scattering compared to a pure MgB2 superconductor. These effects promote flux pinning.

Grant Number

ARC/DP0770205

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