OCMG process for filamentary Nd123 superconductor produced by solution spinning

Applied Superconductivity Pub Date : 1998-02-01 DOI:10.1016/S0964-1807(98)00096-9

Tomoko Goto, Masahide Takahama, Takuji Kimura

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引用次数: 3

Abstract

The oxygen controlled melt growth (OCMG) process for filamentary Nd123 superconductors has been studied to enhance the J_c values. The filamentary Nd_1.18Ba_2.12Cu_3.09O_x (1) and Nd_1.25Ba_2.05Cu_3.10O_x (2) precursors were prepared by dry spinning through a homogeneous aqueous solution containing mixed acetates of Nd, Ba and Cu, poly(vinyl alcohol). The calcined filaments were partially melted in flowing 0.1% O₂+Ar. The T_c values of filament (1) was 94.5 K and 88.5 K for filament (2). By controlling the heating condition, maximum J_c values of 2.4×10⁴ A/cm² and 1.8×10⁴ A/cm² at 77 K and 0 T were attained for filaments (1) and (2), respectively. A window of the optimum heating conditions for filament (2) was narrow and the reproducibility of the high J_c value was poor.

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溶液纺丝制备Nd123长丝超导体的OCMG工艺

研究了线状Nd123超导体的氧控熔体生长(OCMG)工艺，以提高其Jc值。采用干法纺丝法制备了Nd1.18Ba2.12Cu3.09Ox(1)和Nd1.25Ba2.05Cu3.10Ox(2)前驱体，制备了Nd1.18Ba2.12Cu3.09Ox(1)前驱体。煅烧后的细丝在流动的0.1% O2+Ar中部分熔化。灯丝(1)的Tc值为94.5 K，灯丝(2)的Tc值为88.5 K。通过控制加热条件，灯丝(1)和灯丝(2)在77 K和0 T时的最大Jc值分别为2.4×104 A/cm2和1.8×104 A/cm2。灯丝(2)的最佳加热条件窗口较窄，高Jc值的重现性较差。

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Applied Superconductivity

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