High-performance single grain Y–Ba–Cu–O bulk superconductor fabricated by seeded infiltration and growth

Iida, K.; Babu, N. Hari; Withnell, T.D.; Shi, Yunhua; Haindl, S.; Weber, H.W.; Cardwell, D. A.

doi:10.1016/j.physc.2006.04.014

Cited by 20 publications

(17 citation statements)

References 12 publications

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“…Most Y211 particles are quickly trapped in the Y123 matrix instead of being pushed to the bottom side, which leads to a relatively more homogenous distribution of Y211 particles under 100% oxygen atmosphere than in air. This result correlates well with the relatively high J c value, because the critical current density is proportional to V f 211 /d, where V f 211 is the concentration of Y211 particles (in volume percent) and d is the diameter of Y211 particles [17]. In addition, YBCO bulks grown under 1 atm oxygen partial pressure have high density of stacking faults acting as pinning centers, which are beneficial to the higher J c value as well [23].…”

Section: Resultssupporting

confidence: 65%

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Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Yan

Chen

Ikuta

et al. 2010

IEEE Trans. Appl. Supercond.

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By the employment of 1 atm oxygen pressure as the growth atmosphere, we report a success in the enhanced growth rate of the melt-textured (MT) YBCO bulk. A well-oriented c-axis single-domain bulk with a size of 42 mm in diameter was fully grown at a high average growth rate of about 0.32 mm/h, which is 1.5 times larger than that in air. It was found that the increased oxygen partial pressure has a profound influence on the MT growth (MTG) for YBCO. The enhanced growth rate can be interpreted by both increased solubility and diffusion coefficient of yttrium in the Ba-Cu-O liquid under high oxygen partial pressure. After oxygenation, single-domain samples were determined to have a sharp superconducting transition temperature at 91.7 K, indicating that the superconductivity of crystals grown under high oxygen pressure does not degrade. Additionally, due to the rapid growth, the trapping effect of Y211 particles becomes predominant. As a result, a relatively more homogeneous distribution of Y211 particles was observed in the Y123 matrix. Finally, the most important advantage of this technique is that the enhanced growth rate of Y123 gives less opportunity from self-nucleation in the liquid, which takes place beyond the growth window and the embryonic period. Thus, this oxygen-increased MTG process is very promising for producing large-sized YBCO bulks with good superconducting properties.Index Terms-Enhanced growth rate, melt textured (MT), 1 atm oxygen pressure, YBCO bulk.

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Section: Resultssupporting

confidence: 65%

“…J c values were estimated from the M −H loops using the extended Bean critical state formula [16]. The result shows that the maximum J c value is 7 × 10 4 A/cm 2 at zero field, which is relatively high [17]. Fig.…”

Section: Resultsmentioning

confidence: 96%

Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Yan

Chen

Ikuta

et al. 2010

IEEE Trans. Appl. Supercond.

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“…With a view to expanding the fields of application, it is essential to grow bulk RE–Ba–Cu–O (RE = Y, Nd, Sm, Gd, Dy, etc., REBCO) high‐temperature superconductors (HTS) which possess not only high trapped fields and high critical current densities ( J c ) but also of a large grain size and weak link free. The infiltration growth (IG) process which was first reported by Chen et al . has attracted considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Peak Effect in Y–Ba–Cu–O Bulk Materials by the Addition of Nano‐Sized Sm₂O₃

Chen

et al. 2012

J. Am. Ceram. Soc.

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Recently, the significant peak effect was observed in the CeO 2 doped Y-Ba-Cu-O (YBCO) bulk materials grown using the infiltration growth (IG) method. The peak effect was attributed to the compositional fluctuations in the matrix, (Y,Sm)BCO. However, it was found that the peak effect was strongly spatially dependent. The inductively coupled plasma mass spectrometry (ICP-MS) results show that the concentration of Sm ranges from 5.8 3 10 À2 to 7.0 3 10 À3 wt% within the bulk. Notably, the peak effect is only observed in specimens where the concentration of Sm is higher than 1.5 3 10 À2 wt%. The spatial distribution of Sm dissolved from the SmBCO seed is the result of the way in which the liquid (BaCuO 2 and CuO) flows during the melting process of the IG technique. To suppress the variation in the composition, nano-sized Sm 2 O 3 particles are added to the precursor powders in this study. Microstructural analysis demonstrates that with the addition of nano-sized Sm 2 O 3 , the concentration of Sm can be enhanced to be higher than 1.5 3 10 À2 wt% within the bulk. Therefore, the peak effect can be observed throughout the bulk material. Besides, more symmetrical trapped magnetic field profiles can be obtained. P. Paranthaman-contributing editor Manuscript No. 30973.

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“…It is preferable, when during the whole melt texturing process the viscous liquid phase is hold in a skeleton of 2 1 1 particles. The infiltration technique, where the liquid phase is infiltrated into the solid 2 1 1 skeleton, led to bulk samples of excellent superconducting properties [8][9][10]. This method was successfully modified also for preparation of YBCO thick films, where a precursor bilayer consisting of consecutively deposited dense 2 1 1 green coating and a layer of a Ba/Cu rich phases was deposited on various substrates [6,7].…”

Section: Introductionmentioning

confidence: 99%

YBa2Cu3O7 melt textured thick films grown by infiltration process on YSZ substrate prepared by sol–gel method

Plesch

Billik

Cigáň

et al. 2008

Journal of Alloys and Compounds

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High-performance single grain Y–Ba–Cu–O bulk superconductor fabricated by seeded infiltration and growth

Cited by 20 publications

References 12 publications

Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Enhancement of Peak Effect in Y–Ba–Cu–O Bulk Materials by the Addition of Nano‐Sized Sm₂O₃

YBa2Cu3O7 melt textured thick films grown by infiltration process on YSZ substrate prepared by sol–gel method

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High-performance single grain Y–Ba–Cu–O bulk superconductor fabricated by seeded infiltration and growth

Cited by 20 publications

References 12 publications

Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Enhanced Growth Rate of a YBCO Bulk in the Melt-Textured Process Under 1 atm Oxygen Pressure

Enhancement of Peak Effect in Y–Ba–Cu–O Bulk Materials by the Addition of Nano‐Sized Sm2O3

YBa2Cu3O7 melt textured thick films grown by infiltration process on YSZ substrate prepared by sol–gel method

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Enhancement of Peak Effect in Y–Ba–Cu–O Bulk Materials by the Addition of Nano‐Sized Sm₂O₃