Faculté des sciences

The effect of citric and oxalic acid doping on the superconducting properties of MgB₂

Ojha, N. ; Malik, Vivek Kumar ; Singla, Rashmi ; Bernhard, Christian ; Varma, G. D.

In: Superconductor Science and Technology, 2009, vol. 22, no. 12, p. 125014

In this paper we report the effect of carbon doping on the structural and superconducting properties of MgB₂ using citric and oxalic acids as carbon sources. The bulk polycrystalline samples have been synthesized via a standard solid state reaction route with composition MgB₂+x wt% of citric and oxalic acids (x = 0, 5 and 10). The x-ray diffraction results reveal the formation... Plus

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    Summary
    In this paper we report the effect of carbon doping on the structural and superconducting properties of MgB₂ using citric and oxalic acids as carbon sources. The bulk polycrystalline samples have been synthesized via a standard solid state reaction route with composition MgB₂+x wt% of citric and oxalic acids (x = 0, 5 and 10). The x-ray diffraction results reveal the formation of dominantly MgB₂ with only a small amount of impurity phase MgO and substitution of C at the B site of MgB₂ for both dopants. Improvements in the upper critical field (HC2), irreversibility field (Hirr) and high field (>2.5 T) critical current density (JC) have been observed on C doping in the samples. The correlations between superconducting properties and structural characteristics of the samples are described and discussed in this paper.