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NiFe2O4 (NFO) nanoparticle doped YBCO bulk superconductors are fabricated by using a novel top-seed infiltration growth (TSIG) technique. The growth morphology, microstructure and superconducting properties are investigated. The results show that at low doping levels, the normal growth of YBCO single domain is not affected by the NFO doping, but at high doping levels, obvious random nucleation appears at the edge of the sample. The measurement of levitation force indicates that the maximum levitation force on the sample first increases and then decreases with the increase of the NFO doping amount, and the largest levitation force is obtained to be 33.93 N for the sample with a doping level of 0.2% (weight percent). Low-temperature magnetization measurement shows that the YBCO sample exhibits that Tc value decreases with NFO amount increasing, and the superconducting transition width (ΔTc) also broadens gradually. The sample with the optimal doping (0.2% weight percent) presents an enhanced zero-field Jc value of 8.68 × 104 A/cm2, which is 31% higher than the sample without dopant. In addition, a more obvious secondary peak of 4.37 × 104 A/cm2 at a field of 1 T is observed for the 0.2 wt.% NFO doped sample, which indicates the existence of enhanced
δTc pinning in the bulk. The SEM measurement shows that two types of particles are trapped in the Y-123 matrix for YBCO sample doped with 0.2% weight percent NFO: one is the large particle with a size mainly ranging from 0.5 μm to 2.0 μm, and the other is small nano-inclusion mainly ranging from dozens of nanometers to about several hundreds of nanometers. Such a microstructure is very similar to the microstructure of the undoped sample we reported earlier. So whether the NFO nanoparticles exist in the microstructure cannot be judged just from the morphology of the nano-inclusions. The electron probe microarea analysis (EPMA) result shows that different concentration distributions of Ni and Fe elements are observed in the sample doped with 0.2% weight percent NFO, which indicates the separation of NFO nanoparticles in the heat treatment process, and the dissolved Ni and Fe ions finally exist in the form of element substitutions in the YBCO bulk. Such element substitutions can introduce local lattice distortions and weak-superconducting regions into the superconducting matrix, which can act as effective flux pinning centers, and hence improving the properties of the samples. -
Keywords:
- single-domain YBCO /
- top-seeded infiltration growth /
- NiFe2O4 nanoparticle doping /
- superconducting property
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图 1 前驱坯块的装配方式
Figure 1. Configuration pattern of the precursor pellets.
图 2 不同纳米NFO掺杂量下YBCO样品的表面形貌图
Figure 2. Top surface morphology of the YBCO samples with different nano-NFO additions.
图 3 不同纳米NFO掺杂量下YBCO样品的磁悬浮力曲线
Figure 3. The levitation force of the YBCO samples with different nano-NFO additions.
图 4 不同纳米NFO掺杂量下YBCO样品的超导转变温度曲线
Figure 4. Superconducting transition temperature of the YBCO samples with different nano-NFO additions.
图 5 掺杂重量比0.2%纳米NFO的YBCO样品的微观结构图
Figure 5. Microstructure of the YBCO sample doped with weight percent of 0.2% nano-NFO.
图 6 掺杂重量比0.2%纳米NFO的YBCO样品的微区成分分析
Figure 6. Microarea composition analysis of the YBCO sample doped with weight percent of 0.2% nano-NFO.
图 7 掺杂重量比为0%和0.2%纳米NFO的YBCO样品的Jc性能
Figure 7. Jc property of the YBCO samples doped with weight percent of 0% and 0.2% nano-NFO.
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[1] Tomita M, Murakami M 2003 Nature 421 517
Google Scholar
[2] Yang W M, Li G Z, Ma J, Chao X X, Li J W 2010 IEEE Trans. Appl. Supercond. 20 2317
Google Scholar
[3] Kenfaui D, Sibeud P F, Louradour E, Chaud X, Noudem J G 2014 Adv. Funct. Mater. 24 3996
Google Scholar
[4] Namburi D K, Durrell J H, Jaroszynski J, Shi Y, Ainslie M, Huang K, Dennis, A R, Hellstrom E E, Cardwell D A 2018 Supercond. Sci. Technol. 31 125004
Google Scholar
[5] 王妙, 杨万民, 张晓菊, 唐艳妮, 王高峰 2012 61 196102
Google Scholar
Wang M, Yang W M, Zhang X J, Tang Y N, Wang G F 2012 Acta Phys. Sin. 61 196102
Google Scholar
[6] 王妙, 杨万民, 杨芃焘, 王小梅, 张明, 胡成西 2016 65 227401
Google Scholar
Wang M, Yang W M, Yang P T, Wang X M, Zhang M, Hu C X 2016 Acta Phys. Sin. 65 227401
Google Scholar
[7] Delamare, M P, Monot I, Wang J, Provost J, Desgardin G 1996 Supercond. Sci. Technol. 9 534
Google Scholar
[8] 王妙, 杨万民, 马俊, 唐艳妮, 张晓菊, 王高峰 2012 中国科学: 物理学 力学 天文学 42 346
Google Scholar
Wang M, Yang W M, Ma J, Tang Y N, Zhang X J, Wang G F 2012 Sci. Sin.Phys. Mech. Astron. 42 346
Google Scholar
[9] Chen S Y, Chen I G, Wu M K 2005 Supercond. Sci. Technol. 18 916
Google Scholar
[10] Tsuzuki K, Hara S, Xu Y, Morita M, Teshima H, Yanagisawa O, Noudem J, Harnois C, Izumi M 2011 IEEE Trans. Appl. Supercond. 21 2714
Google Scholar
[11] Hara S, Zhou D, Li B, Izumi M 2013 IEEE Trans. Appl. Supercond. 23 7200804
Google Scholar
[12] 郭莉萍, 杨万民, 郭玉霞, 陈丽平, 李强 2015 64 077401
Google Scholar
Guo L P, Yang W M, Guo Y X, Chen L P, Li Q 2015 Acta Phys. Sin. 64 077401
Google Scholar
[13] 张晓娟, 张玉凤, 彭里其, 周文礼, 徐燕, 周迪帆, 和泉充 2015 64 247401
Google Scholar
Zhang X J, Zhang Y F, Peng L Q, Zhou W L, Xu Y, Zhou D F, Izumi M 2015 Acta Phys. Sin. 64 247401
Google Scholar
[14] Li G Z, Dong L, Deng X Y 2016 J. Am. Ceram. Soc. 99 388
Google Scholar
[15] Li G Z, Dong L, Deng X Y 2015 J. Am. Ceram. Soc. 98 2707
Google Scholar
[16] 李国政, 杨万民 2011 60 037401
Google Scholar
Li G Z, Yang W M 2011 Acta Phys. Sin. 60 037401
Google Scholar
[17] Chen S L, Yang W M, Li J W, Yuan X C, Ma J, Wang M 2014 Physica C 496 39
Google Scholar
[18] Shang M, Feng Q, Jiao Y L, Xiao L, Zheng M H, Yan Q Z, Ge C C 2010 Physica C 470 491
Google Scholar
[19] Chen Z, Xue R, Li T, Dai H, Zhang Z 2013 J Alloy. Compd. 553 53
Google Scholar
[20] Zhou Y X, Scruggs S, Salama K 2006 Supercond. Sci. Technol. 19 S556
Google Scholar
[21] Huhtinen H, Awana V P S, Gupta A, Kishan H, Laiho R, Narlikar A V 2007 Supercond. Sci. Technol. 20 S159
Google Scholar
[22] Chen D X, Goldfarb R B 1989 J. Appl. Phys. 66 2489
Google Scholar
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