张胜楠,马小波,崔利军,黄英健,李成山,冯建情,闫果,张平祥.Na掺杂对Bi-2212高温超导体性能影响研究[J].稀有金属材料与工程,2020,49(4):1184~1190.[Shengnan Zhang,Xiaobo Ma,Lijun Cui,Yingjian Huang,Chegnshan Li,Jianqing Feng,Guo yan,Pingxiang Zhang.Influences of Na doping on the superconducting properties of Bi-2212 High temperature superconductors[J].Rare Metal Materials and Engineering,2020,49(4):1184~1190.]
Na掺杂对Bi-2212高温超导体性能影响研究
投稿时间:2018-11-21  修订日期:2019-01-14
中文关键词:  高温超导材料  化学掺杂  涡旋钉扎机制  临界电流密度
基金项目:国家自然基金面上项目No.51472206,聚变堆项目No.2013GB110001,国家重点研发计划No.2017YFB0902303
中文摘要:
      本文采用放电等离子烧结(SPS)工艺制备了Na掺杂的Bi2.1Sr1.96Ca1-xNaxCu2.0O8+d超导材料。Bi-2212前驱体粉末采用改进的共沉淀工艺制备,并在烧结前将前驱体粉末与NaOH混合。本文系统研究了Na离子掺杂对Bi-2212体系晶格结构、相组成、微结构和相关超导性能的影响。Na离子掺杂导致Bi-2212体系相转变温度的显著降低。因此在SPS过程中,烧结温度相应发生了变化。但Na掺杂仍然导致大量Bi2Sr2CuO6 (Bi-2201)相生成,进而导致了超导相含量的降低和织构度的破坏,所以给体系的超导电性带来了负面的影响。另一方面,Na掺杂相Bi-2212中掺入了大量的点缺陷,这些点缺陷可以作为有效钉扎中心。因此,通过优化Na掺杂Bi-2212的烧结工艺,有可能在高场条件下获得体系性能的改善。
Influences of Na doping on the superconducting properties of Bi-2212 High temperature superconductors
英文关键词:High temperature superconductor  Chemical doping  flux pinning mechanism  Critical current density
英文摘要:
      Polycrystalline bulks Bi2.1Sr1.96Ca1-xNaxCu2.0O8+d (Bi-2212) with Na doping content of x=0, 0.02, 0.05 and 0.10 were fabricated by spark plasma sintering (SPS) process. The Bi-2212 precursor powders were synthesized by modified co-precipitation process, and NaOH powders were added into as dopants before calcination. The influences of Na+ ions doping on the lattice parameters, phase composition, microstructures as well as related superconducting properties were systematically investigated. The introduction of Na in Bi-2212 system could cause an obvious decrease of phase transition temperatures. Thus during the SPS process, although the sintering temperature has been greatly decreased accordingly, Na doped Bi-2212 bulks still tended to decomposed into Bi2Sr2CuO6 (Bi-2201) phase, which led to the decrease of both superconducting phase content and texture degrees, and thus caused negative effects on superconducting properties. On the other hand, Na doping introduced more point defects into Bi-2212 matrix, which acted as flux pinning centers during current transport process, and contributed to the increase of current capacity under high field. Therefore, Na doping with optimized sintering parameters should be considered as a promising method for the enhancement of high field current capacity in Bi-2212 system.
作者单位E-mail
张胜楠 西北有色金属研究院超导材料研究所 snzhang@c-nin.com 
马小波 西北有色金属研究院超导材料研究所  
崔利军 Western Superconducting Technologies Co,Ltd,Xi’an  
黄英健 College of Materials Science and Engineering,Xi’an University of Technology,Xi’an  
李成山 西北有色金属研究院超导材料研究所  
冯建情 西北有色金属研究院超导材料研究所  
闫果 Western Superconducting Technologies Co,Ltd,Xi’an  
张平祥 西北有色金属研究院超导材料研究所  
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