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Title of Journal: J Mater Sci Mater Electron

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Abbravation: Journal of Materials Science: Materials in Electronics

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Springer US

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DOI

10.1016/0140-6736(91)91374-4

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1573-482X

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Influences of Ca nonstoichiometry on the supercond

Authors: Shengnan Zhang Chengshan Li Qingbin Hao Jianqing Feng Xiaobo Ma Pingxiang Zhang
Publish Date: 2015/06/16
Volume: 26, Issue: 9, Pages: 7214-7222
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Abstract

Polycrystalline bulks of Bi2Sr2Ca x Cu20O8+δ Bi2212 with x = 090 095 100 and 105 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 Bi2212 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 = 095 bulk which lead to the optimization of both self and infield 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 = 095This 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 2013KCT07

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