1. Enhancements of critical current density in Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductors by additions of SnO2 nanoparticles.
- Author
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Vu, Linh H., Pham, An T., Thien, Nguyen Duy, Nam, Nguyen Hoang, Riviere, Eric, Pham, Q. Nghi, Man, Nguyen K., Binh, Nguyen Thanh, Hong, Nguyen T.M., Cuong, Le Viet, Nguyen, Thanh Long, and Tran, Duc H.
- Subjects
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FLUX pinning , *CRITICAL currents , *STANNIC oxide , *SUPERCONDUCTORS , *CRITICAL temperature , *NANOPARTICLES - Abstract
The impact of adding SnO 2 nanoparticles on the enhancements of critical current density (J c) of the Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10+ δ superconductors was studied. Polycrystalline superconductors with stoichiometry of (Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10+ δ) 1− x (SnO 2) x where was x was ranged from 0.000, 0.002, 0.004, 0.006, 0.008 to 0.010 were made through traditional solid state reaction technique. X-ray diffraction data revealed that all fabricated samples consisted of Bi-2223 and Bi-2212 superconducting phases. The volume fraction of the Bi-2223 phase decreased with SnO 2 addition. Analyses of textural structure using scanning electron microscopy data evidenced a clear decrease in grain orientation and porosity with increased doping levels. SnO 2 presence in connection to Bi-2223 deceleration reduced the critical temperature. Values of J c deduced from the magnetization hysteresis loops measured at different temperatures of 35 K, 45 K, 55 K, 65 K were found to enhance for the SnO 2 added samples. In the x = 0.002 samples, the field dependent J c achieved its maximum values. In order to have a deeper understanding in the improvements of flux pinning properties, small and large bundle fields were determined by using the collective pinning theory. The obtained values indicate the expansion of the two corresponding regimes with appropriate. By analyzing the dependence of normalized J c versus normalized critical temperature, the dominant flux pinning mechanisms in all samples were consistent with δl pinning. Besides, the addition of SnO 2 nanoparticles was likely to produce pinning centers in form of core point as evidenced by using the Dew–Hughes model. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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