Microstructure and Superconductivity of Bi-2223 Tape Prepared by Precursor Powders with Different Particle Sizes

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-09-01 DOI:10.1016/S1875-5372(18)30209-1

Cui Lijun , Zhang Pingxiang , Li Jinshan , Yan Guo , Feng Yong , Liu Xianghong , Li Jianfeng , Pan Xifeng , Zhang Shengnan , Ma Xiaobo , Liu Guoqing

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Abstract

The effects of particle size of precursor powders on microstructure and superconductivity of Bi-2223 tape were investigated. Three kinds of precursor powders with different particle sizes (8, 2, <1 μm) were prepared by a spray pyrolysis method via adjusting the concentration of metal nitrates solution and ball milling. All powders were composed of Bi-2212, (Sr, Ca)_xCu_yO_δ (AEC) and CuO phase after heat treatment. Results show that AEC phase dimension and content increase with decreasing of particle size of the precursor powders. However, the powder with an average particle size of 2 μm has the minimal dimension and content of CuO phase. Among the 37-filaments Bi-2223 tapes fabricated from the three kinds of precursor powders, the one from the powder with average particle size of 2 μm achieves the highest critical current (I_c), which also has the most (Bi, Pb)₃Sr₂Ca₂CuO_x (Pb-3221) and least AEC phase compared to other tapes. The particle size of the precursor powders mainly affects dimension and content of AEC and CuO phase, which further causes difference of I_c and non-superconducting phases in Bi-2223 tape.

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不同粒径前驱体粉末制备Bi-2223带的微观结构和超导性

研究了前驱体粉末粒度对Bi-2223带微观结构和超导性的影响。通过调整金属硝酸盐溶液浓度和球磨，采用喷雾热解法制备了3种不同粒径(8、2、1 μm)的前驱体粉体。所有粉末经热处理后由Bi-2212、(Sr, Ca)xCuyOδ (AEC)和CuO相组成。结果表明:随着前驱体粉体粒径的减小，AEC相尺寸和含量增加;而平均粒径为2 μm的粉末中CuO相的尺寸和含量最小。三种前驱体粉末制备的37丝Bi-2223带中，平均粒径为2 μm的粉末制备的临界电流(Ic)最高，且(Bi, Pb)3Sr2Ca2CuOx (Pb-3221)最多，AEC相最少。前驱体粉末的粒度主要影响AEC相和CuO相的尺寸和含量，从而导致Bi-2223带中Ic相和非超导相的差异。

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