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BaO掺杂对单畴GdBCO超导块材性能的影响(二)

王妙 邬华春 杨万民 杨芃焘 王小梅 郝大鹏 党文佳 张明 胡成西

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BaO掺杂对单畴GdBCO超导块材性能的影响(二)

王妙, 邬华春, 杨万民, 杨芃焘, 王小梅, 郝大鹏, 党文佳, 张明, 胡成西

Influences of BaO doping on the properties of single domain GdBCO bulk superconductors (II)

Wang Miao, Wu Hua-Chun, Yang Wan-Min, Yang Peng-Tao, Wang Xiao-Mei, Hao Da-Peng, Dang Wen-Jia, Zhang Ming, Hu Cheng-Xi
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  • 为了有效地抑制GdBCO超导块材在生长过程中出现的Gd/Ba替换现象,在前期工作的基础上,本文采用顶部籽晶熔渗生长工艺,通过在固相先驱粉中添加不同含量的BaO粒子成功地制备出了一系列高性能的单畴GdBCO超导块材,并且对样品的微观形貌以及临界电流密度进行了研究和分析.结果表明,随着BaO掺杂量的增加,样品中的Gd1+xBa2-xCu3O7-固溶体(Gd123ss)相呈现出减少的趋势,并生成了纳米量级的Gd123ss,这对GdBCO超导样品中存在的Gd/Ba替换起到了很好的抑制作用,使得样品中的GdBa2Cu3O7-(Gd123)超导相有所增加;同时当样品中BaO的添加量在2 wt%4 wt%之间时,样品的临界电流密度在一定程度上得到了有效提高.
    In order to inhibit the Gd/Ba substitution in the growth process effectively, a series of single domain GdBCO bulk superconductors with different ratios of BaO additions in the solid phase pellet is successfully fabricated by the modified top seeded infiltration growth technique on the basis of previous research. In the present work, the macroscopic feature, microstructure and critical current density (Jc) of the single domain GdBCO bulk superconductor are investigated in detail. From the top view of the surface of the single domain GdBCO bulk superconductor, all of the samples exhibit clearly the fourfold growth sector boundaries on their top surfaces, and spontaneous satellite grains are observed in none of these samples. It can be seen that the different ratio of BaO addition (from 1 wt% to 4 wt%) cannot affect the growth morphology of the single domain GdBCO bulk superconductor. At the same time, for observations of the microstructure, the small test specimens of dimensions about 2 mm2 mm2 mm are cut from the top surface of the singe domain GdBCO bulk superconductors with different BaO doping ratios and at a distance 5 mm away from the seed, then microstructure analysis is performed in the cleavage phane of the test specimen by using scanning electron microscope. For the sample with 1 wt% BaO doping, the derivative phase of GdBCO (Gd123ss) is found in the Gd123 superconducting matrix. To detect the atomic ratio of the Gd123ss, energy dispersive X-ray spectrometry measurement is carried out on the samples. It is shown that the atomic ratio of the Gd123ss phase is Gd:Ba:Cu=1.566:1.459:3, which proves successfully that the Gd123ss is a kind of phase with lack of barium. With the increase of BaO doping, the phenomenon of lack of barium is effectively controlled and, the nano Gd123ss phase is generated as the flux pinning centre which can be used to improve the superconducting properties in the growth process of GdBCO bulk superconductor. This results can be concluded that the proper doping ratio can control the element substitution effectively, and the solid solution phase can be greatly reduced to some extent, and the critical current can be improved to a certain extent when the amount of BaO added ranges from 2 wt% to 4 wt%, which is very helpful in inhibiting the Gd/Ba substitution and fabricating the high-quality single domain GdBCO bulk superconductors.
      通信作者: 王妙, cwnanmao@126.com
    • 基金项目: 国家自然科学基金(批准号:51572164,11647050)、教育部科学技术研究重大项目(批准号:311033)和西安航空学院校级科研项目(批准号:2016KY1213)资助的课题.
      Corresponding author: Wang Miao, cwnanmao@126.com
    • Funds: 1Project supported by the National Natural Science Foundation of China (Grant Nos. 51572164, 11647050), the Keygrant Project of Chinese Ministry of Education (Grant No. 311033), and the Scientific Research Project of Xi'an Aeronautical University, China (Grant No. 2016KY1213)
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    Deng Z, He D, Zheng J 2014 Supercond. Sci. Technol. 27 082001

    [2]

    Durrell J H,Dennis A R,Jaroszynski J,Ainslie M D, Palmer K G,Shi Y H,Campbell A M,Hull J,Strasik M, Hellstrom E E 2014 Supercond.Sci.Technol.27 082001

    [3]

    Wang J, Wang S, Zheng J 2015 Chin. Phys. B 24 117403

    [4]

    Yang P T,Yang W M,Wang M,Li J W,Guo Y X 2015 Chin.Phys.B 24 117403

    [5]

    Zhang C P, Wang J R 2003 Rare Metals Lett. 7 1 (in Chinese)[张翠萍, 汪京荣2003稀有金属快报7 1]

    [6]

    Nitadori T, Ichiki T, Misono M 1988 Bull. Chem. Soc. Jpn. 61 621

    [7]

    Nariki S, Sakai N, Murakami M 2002 Supercond. Sci. Technol. 15 648

    [8]

    Xu C, Hu A, Sakai N, Izumi M, Izumi H 2008 Physica C 468 1408

    [9]

    Shi Y, Babu N, Iida K, Cardwell D A 2008 Physica C 468 1408

    [10]

    Tsvetkov D, Sereda V, Zuev A Y 2010 Solid State Ionics 180 1620

    [11]

    Wang M, Yang W M, Yang P T, Wang X M, Zhang M, Hu C X 2016 Acta Phys. Sin. 65 227401 (in Chinese)[王妙, 杨万民, 杨芃焘, 王小梅, 张明, 胡成西2016物理学报65 227401]

    [12]

    Li G Z, Yang W M, Liang W, Li J W 2011 Mater. Lett. 65 304

    [13]

    Wang M, Yang W M, Li J W, Feng Z L, Chen S L 2013 Physica C 492 129

    [14]

    Shi Y, Babu N H, Iida K, Cardwell D A 2007 IEEE Trans. Appl. Supercon. 17 2984

    [15]

    oindent https://imagejnihgov/ij/downloadhtml[2017-2-8]

    [16]

    Murakami M, Gotoh S, Fujimoto H Yamaguchi K, Koshizuka N, Tanaka S 1991 Supercond. Sci. Technol. 4 1S

    [17]

    Tang T W, Qiu F J, Wu D J, Xu K X 2015 J. Inorg. Mater. 30 9 (in Chinese)[唐天威, 邱傅杰, 吴董杰, 徐克西2015无机材料学报30 9]

    [18]

    Izumi T, Nakamura Y, Shiohara Y 1993 J. Crys. Grow. 128 757

    [19]

    Izumi T, Nakamura Y, Shiohara Y 1993 J. Mater. Res. 8 1240

    [20]

    Bean C 1962 Phys. Rev. Lett. 8 250

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  • 收稿日期:  2017-02-08
  • 修回日期:  2017-06-07
  • 刊出日期:  2017-08-05

BaO掺杂对单畴GdBCO超导块材性能的影响(二)

  • 1. 西安航空学院理学院, 西安 710077;
  • 2. 陕西师范大学物理学与信息技术学院, 西安 710062
  • 通信作者: 王妙, cwnanmao@126.com
    基金项目: 国家自然科学基金(批准号:51572164,11647050)、教育部科学技术研究重大项目(批准号:311033)和西安航空学院校级科研项目(批准号:2016KY1213)资助的课题.

摘要: 为了有效地抑制GdBCO超导块材在生长过程中出现的Gd/Ba替换现象,在前期工作的基础上,本文采用顶部籽晶熔渗生长工艺,通过在固相先驱粉中添加不同含量的BaO粒子成功地制备出了一系列高性能的单畴GdBCO超导块材,并且对样品的微观形貌以及临界电流密度进行了研究和分析.结果表明,随着BaO掺杂量的增加,样品中的Gd1+xBa2-xCu3O7-固溶体(Gd123ss)相呈现出减少的趋势,并生成了纳米量级的Gd123ss,这对GdBCO超导样品中存在的Gd/Ba替换起到了很好的抑制作用,使得样品中的GdBa2Cu3O7-(Gd123)超导相有所增加;同时当样品中BaO的添加量在2 wt%4 wt%之间时,样品的临界电流密度在一定程度上得到了有效提高.

English Abstract

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