Entrapment of Y2BaCuO5 particles in melt-textured YBa2Cu3O7−δ crystals and its effect on J

Endo, Akihiko; Chauhan, H. S.; Shiohara, Yuh

doi:10.1016/s0921-4534(96)00595-3

Cited by 55 publications

(48 citation statements)

References 30 publications

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“…The results indicated that, the volume fraction of Gd-211 particles, V 211 , was about 35% for the two samples. Such a high V 211 value may have been obtained here because the micrographs were scanned from a position far away from the seed [16,17]. The average size of Gd-211 particles for the two samples, analysed by assuming that the shape of the Gd-211 particles is spherical, are estimated to be 2.39 and 2.46 µm respectively and the sizes are not very different.…”

Section: Methodsmentioning

confidence: 88%

Fabrication of single-grain GdBa2Cu3O7−x bulk superconductors with a new kind of liquid source by the top seeded infiltration and growth technique

Yang

Xiong

et al. 2010

Pramana - J Phys

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Compared to the conventional melt growth (MG) method, the top seeded infiltration and growth (TSIG) process is an effective way for preparing bulk REBa2Cu3O7−x (RE-123) with finely dispersed RE2BaCuO5 (RE-211) particles. However, it is more complicated and time-consuming, because three kinds of precursor powders, namely, RE-211, RE-123 and BaCuO2, have to be prepared for the conventional TSIG process. In this paper, a new liquid source (NLS) composed of RE-211 and Ba3Cu5O8, was proposed for simplifying the TSIG process, which is different from the regular liquid source (RLS) composed of RE-123 and Ba3Cu5O8. In this modified TSIG technique, we need to prepare only RE-211 and BaCuO2 powders. Single-grain GdBa2Cu3O7−x (GdBCO) bulk superconductors have been fabricated using the RLS and NLS separately. The morphology, microstructure and levitation force of the bulk GdBCO have also been investigated. The results indicate that the NLS can be used to simplify the process flow and improve the efficiency on the fabrication of single-grain GdBCO superconductors.

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Section: Methodsmentioning

confidence: 88%

Fabrication of single-grain GdBa2Cu3O7−x bulk superconductors with a new kind of liquid source by the top seeded infiltration and growth technique

Yang

Xiong

et al. 2010

Pramana - J Phys

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“…This will make the bulk be grown in a sharper and higher temperature window practically, corresponding to lower undercooling degrees. However, according to the established trapping/pushing theory, a higher undercooling, consistent with a large growth rate, can bring both the increase of volume fraction and the decrease of average size of RE‐211 particles in RE‐123 matrix, thus leading to a higher J c 28,29 . As a result, the condensation and up‐shift of the growth temperature window will deteriorate the superconducting properties of the final bulk because of the pushing of more smaller RE‐211 particles by the growth front.…”

Section: Resultsmentioning

confidence: 99%

“…However, according to the established trapping/pushing theory, a higher undercooling, consistent with a large growth rate, can bring both the increase of volume fraction and the decrease of average size of RE-211 particles in RE-123 matrix, thus leading to a higher J c . 28,29 As a result, the condensation and up-shift of the growth temperature window will deteriorate the superconducting properties of the final bulk because of the pushing of more smaller RE-211 particles by the growth front. On the other hand, when the bulk was grown in a narrow and relative higher temperature window (corresponding to small growth rates), the growth process for a whole bulk has to be completed in a relative longer period than the precise time mentioned above.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cooling Time on the Morphology and Levitation Force of Single‐Domain Gd–Ba–Cu–O Bulk Superconductors by the Infiltration and Growth Technique

Yang

2010

Journal of the American Ceramic Society

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The infiltration and growth (IG) process is an effective way for the preparation of bulk REBa2Cu3O7−x (RE‐123) with finely dispersed RE2BaCuO5 (RE‐211) particles compared with the conventional melt growth method. In this paper, single‐domain Gd–Ba–Cu–O (GdBCO) bulk superconductors of 20 mm in diameter, with the same initial composition and cooling temperature window, but with different cooling times, have been fabricated in air by the IG technique. The morphology and levitation force of GdBCO samples are closely related with the cooling time in the same cooling temperature window of 1035°–1015°C. The results indicate that the growth region of single‐domain GdBCO crystal increases with the increasing cooling time, and grows gradually up to the full sample size when the cooling time is >70 h. It is also found that the random nucleation of GdBCO grains can be effectively reduced with prolonging the cooling time. Furthermore, the levitation force of the samples is increasing with the increase of cooling time and nearly saturated when the cooling time reaches above 70 h. The results are very important and helpful for us to reduce the time and energy cost during the fabrication of GdBCO bulk superconductors.

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“…Therefore, The crystal structure of Y123/Y211 composites have been attentively investigated by many research groups (Mucha et al, 2010;Endo et al, 1996;Dias et al, 2009;Yu et al, 1997;Kim and Kim, 2000). In this present work, the influence of Y 2 BaCuO 5 (Y211) doping in the Y123, Y358 and Y257 superconductors were reported.…”

Section: Introductionmentioning

confidence: 80%

Electrical properties and crystal structure of Y123, Y358 and Y257/Y211 composite bulk superconductors

Kruaehong¹

2014

Int. J. Phys. Sci.

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The Y123, Y358 and Y257 bulk superconductors mixed with various ratio of non-superconducting Y211 (Y 2 BaCuO 5 ) were synthesized by solid state reaction. The physical properties of pellets were investigated by d.c. four-probes measurement. The crystal structure was determined using powder X-ray diffraction and the characteristic peaks were determined using the Rietveld full-profile analysis method. Results showed that the T c onset and T c offset decreased with the increasing of Y211 doping. The samples consist of both superconducting phase and the non-superconducting phase. The lattice parameter of Y211 doped samples showed lower c direction than pure samples. The superconducting phase decreased with increasing Y211 content. The non-superconducting phases consists of Pccm (Ba 2 Cu 3 O 6) and Im-3m (BaCuO 2 ) respectively. According to the percentage of superconducting phase, the anisotropy increased with Y211 contents.

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Entrapment of Y2BaCuO5 particles in melt-textured YBa2Cu3O7−δ crystals and its effect on J

Cited by 55 publications

References 30 publications

Fabrication of single-grain GdBa2Cu3O7−x bulk superconductors with a new kind of liquid source by the top seeded infiltration and growth technique

Fabrication of single-grain GdBa2Cu3O7−x bulk superconductors with a new kind of liquid source by the top seeded infiltration and growth technique

Effect of Cooling Time on the Morphology and Levitation Force of Single‐Domain Gd–Ba–Cu–O Bulk Superconductors by the Infiltration and Growth Technique

Electrical properties and crystal structure of Y123, Y358 and Y257/Y211 composite bulk superconductors

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