Improved Flux Pinning Performance of GdBCO Superconductor Bulks by Gd<sub>3</sub>ZrO<sub>7</sub> Additions

Zhang, J. Y.; Zhang, Y. F.; Lou, Ziwei; Zhang, P. H.; Li, C. Y.; Yuan, J. W.; Zhang, X. J.; Lin, Peng; Ma, Y. X.; Xu, Jimmy; Yang, Guang; Izumi, Mitsuru

doi:10.12693/aphyspola.140.40

Cited by 3 publications

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“…Then, J C values of S5 and S7 rapidly drop below those of S0. Meanwhile, a clear second peak appears in the J C dependence of B1, B2 of S3 and C2 of S5, which can be attributed to the presence of chemical compositional fluctuations due to Gd and Ba sites to form Gd 1+x Ba 2−x Cu 3 O 7−δ solid solution phase [ 9 , 18 , 19 , 20 ]. It can be seen that the maximum critical current density value ( J max ) is 4.4 × 10 4 A/cm 2 of the B2 specimen positioned near the boundary of the GdBCO bulk with the Y123 liquid source of the 3-mm thickness.…”

Section: Resultsmentioning

confidence: 99%

“…In general, Gd211 particles in the suitable size can be used as pinning center to improve the superconducting properties, as well as the Gd 1+x Ba 2−x Cu 3 O 7−δ solid-solution phase of a suitable size [ 10 , 19 , 31 ]. Figure 8 shows the microstructure of the B2 specimens positioned near the boundary of GdBCO bulks with the additions of different Y123 liquid source thicknesses.…”

Section: Resultsmentioning

confidence: 99%

“…The sample was first heated to 450 °C in 5 h and held for 40 h; then, the temperature was slowly decreased to 350 °C in 140 h, 300 °C in 30 h. Subsequently, it was cooled down to room temperature. The process has been reported elsewhere [ 19 , 20 , 21 ].…”

Section: Methodsmentioning

confidence: 99%

“…The growth along the a-b plane was allowed due to the Y123 liquid source, which depresses the accumulation of Gd211 particles, so as to dramatically improve the properties of the GdBCO bulk. Compared with Nd or Sm light rare-earth elements, the Gd/Ba substitution range in GdBCO materials [ 17 , 18 , 19 ] is the lowest, and has no serious impact on T C , which can contribute to the generation of a second peak effect to improve the application potential of bulk materials in the high field. Therefore, the GdBCO system is the most promising to obtain bulks with a high performance in the air using the SMG method.…”

Section: Introductionmentioning

confidence: 99%

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Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

et al. 2022

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The performance of critical current density of GdBa2Cu3O7−δ (GdBCO or Gd123) superconductor bulk has an important influence on its practical applications. In this work, four single-domain GdBCO superconductor bulks were successfully processed by the modified top-seeded melt-texture growth method. The addition of a YBa2Cu3O7−δ (Y123) liquid source with different thicknesses, 0 mm (S0), 3 mm(S3), 5 mm (S5), 7 mm (S7), was introduced to study the influence on the superconducting properties. GdBCO bulk with the addition of the Y123 liquid source with a 3-mm thickness shows the best superconducting properties. The addition of the Y123 liquid source results in a decrease in the Gd3+ ion concentration required for Gd123 growth; thus, Gd2BaCuO5 (Gd211) particles in the liquid source need a larger self-decomposition to diffuse Gd3+ ions to Gd123 growth front, which refines the size and leads to a homogenous distribution of the Gd211 particles in the bulks. Thus, the more pinning centers of fined Gd211 particles improve the superconducting properties of GdBCO bulk. With increases in the thickness of Y123 liquid source to 5 mm and 7 mm, high RE3+ (Gd3+ and Y3+) concentration can coarsen Gd211 particles and fuse with Gd211 liquid source. The superconducting properties apparently drop. Therefore, the addition of a Y123 liquid source with a suitable thickness is a positive modification to obtain high-performance GdBCO bulk.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

et al. 2022

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“…The analysis of the microstructure heterogeneity of REBCO superconductor bulks is of great significance for understanding the growth mechanism of REBCO superconductor bulks and improving their superconducting properties. In our previous work [6,7], the nonuniformity distribution have been reported owing to the distribution of the second phase particles, Gd 2 BaCuO 5 (Gd211). Therefore, in this study, the basic top-seeded melt-texture growth method was utilized to growth undoped GdBCO superconductor bulk guided by NdBCO single-seed crystal growth and Y123 liquid source, and the microstructure and superconducting properties of the bulk at different positions were studied.…”

Section: Introductionmentioning

confidence: 95%

Microstructural Nonuniformity of GdBCO Superconductor Bulk

Zhang,

Shen

et al. 2024

J. Phys.: Conf. Ser.

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High-temperature superconducting materials REBa2Cu3O7-δ(REBCO or RE123, RE is a rare earth), can widely be used in electric motors, nuclear magnetic resonance and other fields, because these can trap strong magnetic fields. The top-seeded melt-texture growth method is widely chosen in the preparation and performance research of various REBCO superconductor bulks, which can effectively suppress random nucleation and reduce weak connections between grains, etc. However, the superconductor bulks prepared by this method often have the problem of uniformed microstructure. A single-domain GdBCO superconductor bulk with NdBCO single-seed guidance and Y123 liquid source was successfully growth using the top-seeded melt-texture growth method, and the microscopic morphology of the samples were studied, which exhibits the microstructural nonuniformity of GdBCO superconductor bulk. The specimens at different positions, C1, C2 below the seed, P1, P2 below the cross pattern, of the bulk exhibit critical transition temperature, TC , higher than 94.5 K, with a maximum value of 95.9 K, demonstrating superior superconductivity. Cracks and pores are unevenly distributed in GdBCO superconductor bulk, and the pores mainly gather in the area below the seed and far from the upper surface. At the same distance from the upper surface, specimens below the cross pattern have higher self-field JC values (P1>C1, P2>C2) than specimens below the seed, which should be related to the nonuniformity of the pores.

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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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Improved Flux Pinning Performance of GdBCO Superconductor Bulks by Gd₃ZrO₇ Additions

Cited by 3 publications

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Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

Microstructural Nonuniformity of GdBCO Superconductor Bulk

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

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Improved Flux Pinning Performance of GdBCO Superconductor Bulks by Gd3ZrO7 Additions

Cited by 3 publications

References 0 publications

Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source

Microstructural Nonuniformity of GdBCO Superconductor Bulk

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

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Improved Flux Pinning Performance of GdBCO Superconductor Bulks by Gd₃ZrO₇ Additions