Abstract
We investigated the flux pinning behavior induced by gamma irradiation in Y1Ba2Cu3O(7−x) silver-added samples. The superconductors were prepared through solid-state route and added with silver in amounts of 0-, 6.5-, and 20-wt%, following which the samples were irradiated by high-energy gamma irradiation (γ) at doses of 0, 500, and 1500 kGy at the dosage rate of 8.2 kGy/h. We performed magnetization loops to study the flux pinning of vortex in YBCO/Ag superconductors. We found that silver addition and irradiation on superconductors may increase the width in magnetization loops, which is related to the enhancement in the critical current density, J c . We established that an interaction between silver addition and irradiation that results in higher values in J c for YBCO/Ag irradiated samples already exists. The J c in samples containing 20-wt% of silver decreased with irradiation because a higher content of silver produces small crystals and secondary phases growing. On comparing the TGA analysis for both YBCO and YBCO/Ag samples, we found higher-weight oxygen losses in YBCO silver samples, which suggests that silver increases the oxygen saturation content. The higher oxygen content found on irradiated specimens it is indicative of oxygen losses from CuO chains or CuO2 planes reached by γ-irradiation.
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Rangel, R., Galván, D.H., Adem, E. et al. Determination of the Intragrain Critical Current Density and Thermogravimetric Analysis on YBCO/Ag Superconductors Irradiated with 60Co Gamma Rays. Journal of Superconductivity 12, 641–648 (1999). https://doi.org/10.1023/A:1007748018298
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DOI: https://doi.org/10.1023/A:1007748018298