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首页> 外文期刊>International journal of materials science >To Clarify the Optimization of Matrix Chemical Ratio for High Critical Current Density J_c in (Nd, Eu,Gd)Ba_2Cu_3O_y Superconductors using Flux Creep-flow Model
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To Clarify the Optimization of Matrix Chemical Ratio for High Critical Current Density J_c in (Nd, Eu,Gd)Ba_2Cu_3O_y Superconductors using Flux Creep-flow Model

机译：使用通量蠕变流模型澄清（Nd，Eu，Gd）Ba_2Cu_3O_y超导体中高临界电流密度J_c的基体化学比的优化

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摘要

The magnetic field dependence of critical current density J_c for a group of specimens of (Nd, Eu, Gd)Ba_2Cu_3O_y superconductors with changing matrix chemical ratio such as Eu/Gd ratio was estimated from the hysteresis measurements by using the Bean model. The highest peak critical current density J_(cp) was observed for (Nd_(0.33)Eu_(0.39)Gd_(0.27))Ba_2Cu_3O_y specimen with addition of 3 mol% NEG-211 particles and it was about 1.77×10~9 A/m~2 at higher magnetic field of 2.5T. To clarify the speculation about the optimization of the peak critical current density J_(cp) , the experimental results are compared with the theoretical analysis based on flux creep-flow model taking the distribution of the flux pinning strength into account. The number of flux lines in the flux bundle (g~2), the most probable value (A_m), the distribution width (δ~2) and the other pinning parameters m,γ are determined so that a good fit is obtained between the experimental and theoretical results. The higher the value of A_m of sample 3 mol% NEG-211 phase particles (i.e., the higher value of peak critical current density, J_(cp)) than 7 mol% addition sample suggests that it is justified the speculation about the optimization of the peak critical current density J_(cp) due to the maximum pinning effect caused by combining the appropriate concentration of 211 secondary phase particles with the optimum chemical ratio in the matrix.
机译：通过使用Bean模型从磁滞测量值中估计了具有（Ed / Gd）比率等基体化学比率变化的一组（Nd，Eu，Gd）Ba_2Cu_3O_y超导体样品的临界电流密度J_c的磁场依赖性。添加3 mol％NEG-211颗粒时，（Nd_（0.33）Eu_（0.39）Gd_（0.27））Ba_2Cu_3O_y样品的最高峰值临界电流密度J_（cp）约为1.77×10〜9 A /在2.5T的较高磁场下为m〜2。为了阐明有关优化峰值临界电流密度J_（cp）的推测，将实验结果与基于磁通蠕变流模型的理论分析进行了比较，并考虑了磁通钉扎强度的分布。确定焊剂束中的焊剂线数（g〜2），最可能值（A_m），分布宽度（δ〜2）和其他钉扎参数m，γ，以便在焊剂束之间获得良好的拟合度。实验和理论结果。样品3 mol％NEG-211相颗粒的A_m值比7 mol％添加样品的高（即，峰值临界电流密度J_（cp）的值更高）表明，对于优化峰值临界电流密度J_（cp）是由于将适当浓度的211次生相颗粒与基质中的最佳化学比结合而产生的最大钉扎效应所致。

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  • 来源
    《International journal of materials science》 |2012年第2期|129-136|共8页
  • 作者

    M.N. Hasan; E.S. Otabe; M. Muralidhar; Chotan Das;

  • 作者单位

    Department of Physics, Chittagong University, Chittagong-4331, Bangladesh;

    Department of Computer Science and Electronics,Kyushu Institute of Technology, Iizuka-820-8502, Japan;

    Senior Scientific Officer, Superconductivity Research Laboratory,Tokyo 105-0023, Japan.;

    Department of Physics, Chittagong University, Chittagong-4331, Bangladesh;

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