Publication Details

Zeng, R., Lu, L., Wang, J., Li, W., Shi, D., Horvat, J. Dou, S. X. (2008). Improvement of Jc and Hc2 in MgB2 superconductor with citric acid addition. In 8th European Conference on Applied Superconductivity (EUCAS 2007), 16-20 September, Brussels, Belgium. Journal of Physics: Conference Series, 97 012215-1-012215-6. >


This paper reports on the fabrication and characterization of citric acid (CA)-C6H8O7 added MgB2 superconductor. The relationships between microstructures, critical current density (Jc), critical temperature (Tc), upper critical field (Hc2), irreversibility field (Hirr), and normal state resistivity for 10 wt% C6H8O7 added MgB2 samples sintered at temperatures from 650C to 950C were systematically studied. A reduction in Tc and in lattice parameter a due to the C substitution and possible oxygen (O) effects occurs wtih C6H8O7 addition. Jc, Hc2, and Hirr are significantly enhanced, however, with the addition of C6H8O7. All the samples exhibit Jc above 104 A/cm2 at 5 K and 8 T. This value is higher than for the un-doped MgB2 by a factor of 9. The significant improvement in the superconducting properties is attributed to the lattice distortion due to the C and possible oxygen (O) substitution for boron, with the C and O coming from the decomposition of C6H8O7.>

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