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为提高REBCO涂层导体在强磁场下的超导载流能力，本文采用离子辐照的方式拟在REBCO涂层导体产生缺陷以引入磁通钉扎中心。实验利用320kV高电荷态离子综合研究平台对REBCO二代高温超导带材进行H+离子辐照，进一步采用Doppler展宽慢正电子束分析(DB-SPBA)及Roman光谱技术研究了剂量在5.0×1014~1.0×1016范围内H+离子辐照后REBCO带材的微观结构的变化规律。研究结果表明，随H+离子辐照剂量增大，Y0.5Gd0.5Ba2Cu3O7-δ超导层中产生了包括空位或空位团簇型等类型缺陷，缺陷增多，缺陷类型复杂性增加；涂层中氧原子发生重排，Cu-O面间距增加，涂层正交相结构被破坏。此类离子辐照产生的缺陷对磁通钉扎中心的引入奠定基础。In order to further improve the superconducting current carrying capacity of REBCO coated conductor under strong magnetic field, ion irradiation is used to generate the pinning center of introduced magnetic flux in the REBCO coated conductor. In this paper, the H-ion irradiation of REBCO second generation high temperature superconductor strip was carried out by using the 320kV high charge state ion synthesis research platform. DB-SPBA combined with Raman spectroscopy was used to measure the change of microstructure in YBCO samples irradiated by H+ions within the range of 5.0×1014~1.0×1016. The positron annihilation parameters in YBCO before and after irradiation were analyzed. It is found that after 100 keV H+ion irradiation, a large number of defects including vacancy, vacancy group or dislocation group are produced in the superconducting layer. The larger the irradiation dose, the more vacancy type defects are produced, the more complex the defect types are, and the annihilation mechanism of positrons in the defects changes. Raman spectroscopy results show that with the increase of H+ion irradiation dose, the oxygen atoms in the coating rearrange, the plane spacing increases, the orthogonal phase structure of the coating is destroyed, and the degree of order decreases. The defects produced by such ion irradiation lay a foundation for the introduction of flux pinning centers. Further research can be carried out in combination with X-ray diffractometer, transmission electron microscope, superconductivity and other testing methods to provide theoretical and practical reference for the optimization of material properties.
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Keywords:
- 2G-HTS /
- Ion irradiation /
- Positron annihilation /
- Holes
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