Improvement in levitation force performance of bulk MgB2 superconductors through coronene powder adding
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CitationErdem, O., Abdioğlu, M., Güner, S.N., Çelik, S. & küçükömeroğlu, T. (2017). Improvement in levitation force performance of bulk MgB2 superconductors through coronene powder adding. Journal of Alloys and Compounds, 727, 1213-1220. https://doi.org/10.1016/j.jallcom.2017.08.242
The effect of coronene (C24H12) addition on the levitation force properties of MgB2 superconductor has been investigated for the first time in this study. the polycrystalline disk-shaped MgB2 + y wt % C24H12 samples (y = 0, 2, 4, 6, 8, 10), were synthesized by a pellet/closed tube method at 850 degrees C under Ar atmosphere, after hot pressing at 200 degrees C. XRD analysis indicates a decrease in lattice parameters of coronene added samples and confirms substitution of carbon in boron sites. An increase in lattice strain and a decrease in grain size are observed due to the carbon substitution effect. Vertical and lateral levitation force measurements under zero-field-cooled and field-cooled regimes were carried out at different temperatures of 20, 25 and 30 K. It was found that the coronene addition significantly increases the high-field critical current density of MgB2. the J(c) values were obtained as 4.6 x 10(3) Acm(-2) and 1.3 x 10(4) Acm(-2) for pure and 4 wt % coronene added samples at 20 K and 4 T. in addition, the levitation force measurements show that 4 wt % coronene adding is very effective in increasing both the vertical and lateral levitation force performances at 20 K. the maximum levitation force for 4 wt % coronene added sample corresponds to 7.58 N/g whereas the reference sample shows 6.73 N/g at 20 K in ZFC regime. the results point out that the hydrocarbon of C24H12 is an effective carbon-containing additive for MgB2 and can be useful for optimizing the levitation performance of MgB2 superconductors for potential applications. (C) 2017 Elsevier B.V. All rights reserved.