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Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks

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Abstract

Polycrystalline bulks of Bi2Sr2Ca x Cu2.0O8+δ (Bi-2212) with x = 0.90, 0.95, 1.00 and 1.05 were fabricated by spark plasma sintering technique. The influences of Ca nonstoichiometry on the microstructures, carrier concentration, as well as the related superconducting properties were systematically investigated. XRD analyses revealed the corresponding change of lattice parameters of Bi-2212 phase with the Ca nonstoichiometry. The average particle radius in the sintered bulks underwent an obvious change with the increase of Ca content, which could be attributed to the variation of thermodynamic properties. AC susceptibility measurements exhibited the optimization of intergrain connections in Ca = 0.95 bulk, which lead to the optimization of both self- and in-field critical current density, J c of this system. The optimization of microstructures also caused the enhancement of surface pinning. Based on the enhancements of both intergrain connections and flux pinning properties, an obvious improvement of critical current density was obtained with the optimal doping content of Ca = 0.95.

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Acknowledgments

This research was financially supported by National “973” Project, under Contract No. 2011CBA00104, National Natural Science Foundation of China under Contract No. 51472206, the international scientific and technological cooperation projects of China No. S2010GR0518, the national ITER Program of China No. 2013GB110001, and the Program for Innovative Research Team in Shaanxi Province No. 2013KCT-07.

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The authors declared that they have no conflicts of interest to this work.

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  1. Superconducting Materials Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, China

    Shengnan Zhang, Chengshan Li, Qingbin Hao, Jianqing Feng, Xiaobo Ma & Pingxiang Zhang

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  1. Shengnan Zhang
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  2. Chengshan Li
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Correspondence to Shengnan Zhang.

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Zhang, S., Li, C., Hao, Q. et al. Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks. J Mater Sci: Mater Electron 26, 7214–7222 (2015). https://doi.org/10.1007/s10854-015-3347-y

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