Sustainable recycling for epitaxial growth of YBa2Cu3O7−δ cryomagnets: From discarded buffer-crystals to superior seeds

Zhu, Yanhan; Xu, Huajun; Yang, Jinlong; Gao, Qiang; Gu, Xiafan; Wang, Xuechun; Zhou, Difan; Yao, Xin

doi:10.1016/j.ceramint.2022.12.209

Cited by 3 publications

(1 citation statement)

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“…Buffer-assisted technology is a recognized effective method to improve the performance of high-temperature superconductor bulks [ 16 , 17 , 18 , 19 , 20 ]. By optimizing the composition and the aspect ratio of the buffer layer, Namburi et al [ 21 ] improved the problems related to interfacial stress and seed contamination, and then YBCO bulk superconductors with a diameter of 25~35 mm were successfully prepared.…”

Section: Introductionmentioning

confidence: 99%

The Performance of the Two-Seeded GdBCO Superconductor Bulk with the Buffer by the Modified TSMG Method

Zhang

Lou

et al. 2023

Micromachines

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The multiseeding technique is a method to grow large-sized REBa2Cu3O7−δ (REBCO, where RE is a rare earth element) high temperature superconducting bulks. However, due to the existence of grain boundaries between seed crystals, the superconducting properties of bulks are not always better than those of single grain bulks. In order to improve the superconducting properties caused by grain boundaries, we introduced buffer layers with a diameter of 6 mm in the growth of GdBCO bulks. Using the modified top-seeded melt texture growth method (TSMG), that is, YBa2Cu3O7−δ (Y123) as the liquid phase source, two GdBCO superconducting bulks with buffer layers with a diameter of 25 mm and a thickness of 12 mm were successfully prepared. The seed crystal arrangement of two GdBCO bulks with a distance of 12 mm were (100/100) and (110/110), respectively. The trapped field of the GdBCO superconductor bulks exhibited two peaks. The maximum peaks of superconductor bulk SA (100/100) were 0.30 T and 0.23 T, and the maximum peaks of superconductor bulk SB (110/110) were 0.35 T and 0.29 T. The critical transition temperature remained between 94 K and 96 K, with superior superconducting properties. The maximum JC, self-field of SA appeared in specimen b5, which was 4.5 × 104 A/cm2. Compared with SA, the JC value of SB had obvious advantages in a low magnetic field, medium magnetic field and high magnetic field. The maximum JC, self-field value appeared in specimen b2, which was 4.65 × 104 A/cm2. At the same time, it showed an obvious second peak effect, which was attributed to Gd/Ba substitution. Liquid phase source Y123 increased the concentration of the Gd solute dissolved from Gd211 particles, reduced the size of Gd211 particles and optimized JC. For SA and SB under the joint action of the buffer and the Y123 liquid source, except for the contribution of Gd211 particles to be the magnetic flux pinning center with the improvement of JC, the pores also played a positive role in improving the local JC. More residual melts and impurity phases were observed in SA than in SB, which had a negative impact on the superconducting properties. Thus, SB exhibited a better trapped field and JC.

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