The Large Domain Growth of an Ag-Doped Re-System Superconductor in Air

Haseyama, Shuetsu; Kohayashi, S.; Satoh, Munetake; Miyairi, Hidekazu; Nakane, Hiroshi; Nagàya, Shigeo

doi:10.1007/978-4-431-66879-4_153

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Although the field distribution was single peaked, the peak value was only 0.4 T at 77 K, because of the small size of the sample. Haseyama et al [6] reported the in-air preparation of Ag-added SmBCO with a diameter of 45 mm. The field profile revealed no indication of cracking, but the peak value of the trapped field was 0.74 T [7], which is very close to the value reported for YBCO of the same size [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and superconducting properties ofc-axis aligned, single-domain NdBCO/Ag, melt-processed superconductors

Ikuta

Hosokawa

Yoshikawa³

et al. 2000

Supercond. Sci. Technol.

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We prepared c-axis aligned, large single-domain Nd-Ba-Cu-O (NdBCO) bulk superconductors with the addition of Ag 2 O by the melt-processing technique under a flowing Ar gas atmosphere using Ag-free NdBCO as seed crystals. The melt-processing condition has been elaborated by varying the contents of Ag 2 O and CeO 2 , and the molar ratio of Ba to Cu. We successfully synthesized c-axis aligned, single-domain samples, free from serious cracks or weak links, 30 mm in diameter and 13 mm in thickness in the range of 15-20 wt% Ag 2 O, 0-0.5 wt% CeO 2 and 0.706-0.76 for the Ba to Cu ratio. The largest trapped field of these NdBCO samples was 1.23 T at 77 K and 7.0 T at 42 K, while fracturing of the sample occurred at a further lower temperature. We found that the field trapping performance of the present NdBCO/Ag samples is almost the same as that of our previously reported SmBCO/Ag samples, but the critical stress of fracturing was smaller for NdBCO/Ag.

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Section: Introductionmentioning

confidence: 99%

Synthesis and superconducting properties ofc-axis aligned, single-domain NdBCO/Ag, melt-processed superconductors

Ikuta

Hosokawa

Yoshikawa³

et al. 2000

Supercond. Sci. Technol.

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“…A large electromagnetic force acts on the bulk superconductors when they trap a large field, which sometimes leads to a fatal fracture [4,5]. It has been reported that Ag addition is effective in improving the mechanical properties of RE-Ba-Cu-O bulk superconductors [6,7]. However, three bending and four bending tests for small specimens failed to detect the beneficial effect of Ag addition on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of bulk superconductors

Miyamoto

Nagashima

Sakai

et al. 2000

Supercond. Sci. Technol.

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Recent advancement in the bulk fabrication process has enabled the production of large single-grain bulk RE-Ba-Cu-O superconductors with high J c values, which can trap fields much higher than those associated with conventional permanent magnets. However, a large electromagnetic force acts on the bulk superconductors when they trap a large field, which sometimes leads to fatal fracture. In this study, we measured mechanical properties of single-domain Y-Ba-Cu-O and Sm-Ba-Cu-O bulk superconductors from the output of strain gauges glued directly to the sample surface. The stress was applied to the samples by reducing the external fields from 10 to 0 T at 50 K. It was found that Ag addition is effective in improving the mechanical properties of melt processed Y-Ba-Cu-O and Sm-Ba-Cu-O.

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