Effect of combined addition of graphene oxide and citric acid on superconducting properties of MgB2
作者： Sudesh , S. Das , C. Bernhard , G.D. Varma
DOI: 10.1016/J.PHYSC.2014.12.005
关键词:
摘要: Abstract In the present work, polycrystalline samples with compositions MgB2 + 3wt% GO + x wt% C6H8O7 (x = 0, 5 and 10) have been synthesized to study effect of combined addition graphene oxide (GO) citric acid (C6H8O7) on superconducting properties MgB2. X-ray diffraction studies show formation hexagonal crystal structure MgB2 space group P6/mmm in all samples. We observe that GO sample improves grain connectivity consequently enhances critical current density significantly no substantial change Tc. However for this sample, there is significant improvement Hc2 Hirr. With acid, JC(H), Hirr are observed improve substantially as compared pristine added For example JC(10 K, T) x = 10 has improved by a factor ∼15 pure ∼5.5 x = 0 sample. Furthermore, Hc2(0) enhanced 13 T while it increased ∼10 comparison Enhanced flux pinning acid.
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