Journal article

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

  • Ojha, N. Department of Physics, Indian Institute of Technology Roorkee, India
  • Malik, Vivek Kumar Department of Physics and Fribourg Centre for Nanomaterials-FriMat, University of Fribourg, Switzerland
  • Singla, Rashmi Department of Physics, Indian Institute of Technology Roorkee, India
  • Bernhard, Christian Department of Physics and Fribourg Centre for Nanomaterials-FriMat, University of Fribourg, Switzerland
  • Varma, G. D. Department of Physics, Indian Institute of Technology Roorkee, India
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    23.10.2009
Published in:
  • Superconductor Science and Technology. - 2009, vol. 22, no. 12, p. 125014
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/301446
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