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为解决传统元素掺杂YBa2Cu3O7-δ (YBCO)薄膜时掺杂相尺寸不可控和分布不均匀的问题, 本文采用预制纳米晶添加技术在YBCO高温超导带材中引入了弥散分布的小尺寸BaZrO3 (BZO)纳米晶作为磁通钉扎中心, 显著提高了YBCO薄膜在低温下的在场性能. 本研究系统研究了原始尺寸约为8 nm的BZO纳米晶不同浓度的添加效果. 实验结果表明, 在4.2, 30和77 K温度条件下, BZO纳米晶添加对YBCO的自场和在场性能提升的最佳摩尔百分比浓度为8%. 在30 K@3 T时, BZO-8%的Fp约为92.06 GN/m3, 分别是BZO-4%和原始样品的1.54倍和2.3倍.
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关键词:
- YBa2Cu3O7-δ /
- 磁通钉扎 /
- BaZrO3添加 /
- 临界电流密度
Introducing nano heterogeneous phases into YBa2Cu3O7-δ (YBCO) superconducting films is a common way to improve its flux pinning properties and in-field performances. The heterogeneous phases generated through traditional element doping strategies is highly sensitive to the sintering conditions, making the growth of the nano inclusions difficult to control under high-temperature environments. Unintended large-scale growth and aggregation of the doped phases can significantly reduce the efficiency of flux pinning of YBCO superconducting films, thereby limiting the overall enhancement of pinning performance in superconducting thin films. This occurs because the size of the vortex core (≈2ξ) cannot be effectively matched with excessively large defects. To address this challenge, the incorporation of monodisperse, small-sized prefabricated nanocrystals into YBCO superconducting coated conductors fabricated by the metal organic deposition (MOD) method offers an effective solution. This method can significantly improve the uniformity of heterogeneous phase size and spatial distribution, enabling the formation of dispersed and size-controllable artificial flux pinning centers. Such a strategy represents one of the most promising methods of enhancing magnetic flux pinning and increasing the critical current density under applied magnetic fields through MOD route. In this study, the prefabricated nanocrystals addition technology is adopted to introduce the mono-dispersed small-sized BaZrO3 (BZO) nanocrystals as flux pinning centers in YBCO high-temperature superconducting tapes, resulting in the significant enhancement of the in-field performance of YBCO films at low temperatures. This study systematically examines the effects of adding BZO nanocrystals with an initial size of approximately 8 nm at various mol concentrations from 4% to 10%. The results indicate that the optimal mole concentration for improving both self-field and field properties of YBCO is 8% BZO under temperature conditions of 4.2, 30, and 77 K. At 30 K and 3 T, the Fp value for the sample with a mole concentration of 8% BZO is approximately 92.06 GN/m3, which is 1.54 times higher than that of the mole concentration of 4% BZO sample and 2.3 times higher than that of the original sample.-
Keywords:
- YBa2Cu3O7-δ /
- flux pinning /
- BaZrO3 addition /
- critical current
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图 1 (a) BZO纳米晶的TEM图像; (b) XRD图谱; (c) 平均粒径为(8 ± 2) nm的粒径分布曲线; (d) BZO纳米晶在乙醇和YBCO前驱体溶液中的动态光散射(DLS)粒径分布曲线
Fig. 1. (a) TEM image of BZO nanocrystals; (b) XRD pattern; (c) size distribution profile indicating an average particle size of (8 ± 2) nm; (d) dynamic light scattering (DLS) particle size distribution curves of BZO nanocrystals in ethanol and YBCO precursor solutions.
图 2 (a) 不同BZO浓度下BZO-YBCO膜的XRD谱图; (b) 添加摩尔百分比浓度为10% BZO纳米晶的YBCO膜的(005)-ω扫描图和(c) (103)-φ扫描图; (d) 添加不同BZO浓度下面外ω-(005)扫描图和面内φ-(103) YBCO膜的FWHM图
Fig. 2. (a) The XRD patterns of the BZO-YBCO films with different BZO concentrations and (b) the (005)-ω scan and (c) (103)-φ scan of the BZO nanocrystal added YBCO film with 10 mol/mol; (d) FWHM of out-of-plane ω-(005) scan and in-plane φ-(103) YBCO films added with different BZO concentrations.
图 3 YBCO纳米复合膜的组成与微观结构 (a) TEM横截面图; (b), (c) 高分辨率TEM图像(显示YBCO基体内孤立的、随机取向的BZO颗粒); (d) 粗化前后BZO纳米晶的粒径分布
Fig. 3. Composition and microstructure of the YBCO nanocomposite film: (a) TEM cross-sectional image; (b) high-resolution TEM image showing isolated, randomly oriented BaZrO3 particles within the YBCO matrix; (c) particle size distribution comparison of BZO nanocrystals before and after coarsening.
图 4 不同浓度BZO纳米晶的YBCO薄膜在77 K下的自场Ic. 每条YBCO带长约1 m
Fig. 4. Self-field Ic of YBCO films with different BZO concentrations at 77 K. Each tape is about 1 meter.
图 5 不同温度下添加不同浓度BZO纳米晶的YBCO薄膜的临界电流密度(Jc)和钉扎力(Fp)随磁场的变化 (a) 4.2 K; (b) 30 K; (c) 不同温度和磁场条件下加入不同浓度BZO的YBCO薄膜的临界电流(Ic)的变化趋势
Fig. 5. Variation of critical current density (Jc) and pinning force (Fp) with magnetic field for YBCO films with different concentrations of BZO nanocrystals at various temperatures: (a) 4.2 K; (b) 30 K; (c) the variation trend of critical current (Ic) for YBCO films with different concentrations of BZO addition under various temperatures and magnetic field conditions.
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