Preform optimization in infiltration growth process: An efficient method to improve the superconducting properties of YBa2Cu3O7−δ

Kumar, N. Devendra; Rajasekharan, T.; Seshubai, V.

doi:10.1016/j.physc.2013.07.015

Cited by 27 publications

(15 citation statements)

References 53 publications

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“…The IG‐process is more attractive to control the final secondary phase size and its dispersion in 123 matrix as compared to the normal top‐seeded melt growth process. Already, several reports indicated that optimized processed IG‐samples exhibited the controlled microstructure as results improved performance in Y‐123 material . Recently, we also identified the influence of the growth temperature on critical current density ( J c ) for IG‐processed Y‐123 material.…”

Section: Resultsmentioning

confidence: 99%

Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase

Muralidhar

Nakazato

Zeng

et al. 2015

Physica Status Solidi (a)

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The infiltration‐growth (IG) technique enables the uniform and controllable Y2BaCuO5 (Y211) secondary phase particles formation within the YBa2Cu3Oy (Y123) matrix. Recent results clarified that the flux pinning performance of the Y123 material was dramatically improved by optimizing the processing conditions during the IG process. In this paper, we adapted the IG technique and produced several samples with addition of nanometer‐sized Y211 secondary phase particles, which were produced by a ball milling technique. We found that the performance of the IG processed Y123 material dramatically improved in the low field region for a ball milling time of 12 h as compared to the samples without a ball milling step. Magnetization measurements showed a sharp superconducting transition with an onset Tc at around 92 K. The critical current density (Jc) at 77 K and zero field was determined to be 224 022 Acm−2, which is higher than the not ball‐milled sample. Furthermore, microstructural observations exhibited a uniform microstructure with homogenous distribution of nanosized Y‐211 inclusions within the Y‐123 matrix. The improved performance of the Y‐123 material can be understood in terms of fine distribution of the secondary phases.

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Section: Resultsmentioning

confidence: 99%

Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase

Muralidhar

Nakazato

Zeng

et al. 2015

Physica Status Solidi (a)

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“…technique, despite being used for nearly two decades [26][27][28][29][30][31][32][33][34][35], has never been applied as widely as the TSMG approach because of two major limitations: (i) The poor success rate of single grain fabrication and; (ii) the superconducting properties of the (RE)BCO material obtained by the IG approach are significantly inferior compared to their TSMG counterparts. Only recently, systematic studies have been carried out that have led to the fabrication of (RE)BCO bulk superconductors by IG that are now almost comparable with those processed by TSMG.…”

Section: Reliable Tsig the Infiltration And Growth (Ig)mentioning

confidence: 99%

Reliable single grain growth of (RE)BCO bulk superconductors with enhanced superconducting properties

Cardwell

Shi

Numburi

2020

Supercond. Sci. Technol.

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We review recent progress in the successful and reliable fabrication of large grain (RE)BCO and (RE)BCO-Ag bulk high temperature superconductors by three primary processing methodologies: top-seeded melt growth (TSMG), top-seeded infiltration growth (TSIG) and a combined processing route comprising both TSMG and TSIG. Several significant and useful modifications have been made to these processing routes over the recent years in order to grow (RE)BCO single grains reliably and to enhance their superconducting properties. With respect to the reliable growth of (RE)BCO single grains, we have further developed the so-called buffer technique for reliable seeding, which includes identifying and providing an appropriate liquidrich phase at the bottom of pellet. This modification has proved to be critical to the success of the newly-developed fabrication techniques presented here. In addition, we have addressed existing and significant challenges in the context of improving the superconducting properties of the bulk samples by controlling the microstructures of single grain materials (porosity and the RE-211 distribution, in particular) and by suppressing the extent of RE/Ba substitution during grain growth. Finally, we provide a short summary of the potential pathways towards realising practical applications of these technologically important materials in the near future.

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“…However, there is another drawback of the MTMG approach: the uncontrolled shrinkage of the original pellet [5]. Due to these problems, another approach was introduced as early as 1991 [6][7][8][9][10]; the so-called infiltration growth (IG) technique. Here, a Y-211 precursor pellet is formed which is then used as a base material together with a liquid source and a seed crystal.…”

Section: Introductionmentioning

confidence: 99%

Secondary phase particles in bulk, infiltration-growth processed YBCO investigated by transmission Kikuchi diffraction and TEM

Koblischka-Veneva¹,

Koblischka²,

Schmauch³

et al. 2020

Supercond. Sci. Technol.

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We present results of the first application of the transmission Kikuchi diffraction (TKD) technique to bulk, infiltration growth (IG)-processed YBa 2 Cu 3 O 7−δ (YBCO) superconductors with embedded Y 2 BaCuO 5 (Y-211) nanoparticles. By means of focused ion-beam (FIB) milling, TEM slices were prepared from mechanically polished surfaces of bulk, IG-processed YBCO samples. The required optical transparency was reached by additional polishing the resulting surfaces using the FIB and Ar-ion milling. For TKD, the sample was mounted on a homebuilt sample holder in the SEM, which provides the required inclination for TKD. The improved spatial resolution of TKD enabled the investigation of the small Y-211 particles (diameter of about 60-210 nm) embedded in the superconducting YBCO matrix. The fabricated TEM slices further enable the application of transmission electron microscopy to the same sample sections. These tiny Y-211 particles embedded within the YBCO matrix are, together with their strain fields, directly responsible for the high irreversibility fields due to the effective flux pinning of the IG-processed samples.

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Preform optimization in infiltration growth process: An efficient method to improve the superconducting properties of YBa2Cu3O7−δ

Cited by 27 publications

References 53 publications

Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase

Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase

Reliable single grain growth of (RE)BCO bulk superconductors with enhanced superconducting properties

Secondary phase particles in bulk, infiltration-growth processed YBCO investigated by transmission Kikuchi diffraction and TEM

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Preform optimization in infiltration growth process: An efficient method to improve the superconducting properties of YBa2Cu3O7−δ

Cited by 27 publications

References 53 publications

Record critical current densities in IG processed bulk YBa2Cu3Oy fabricated using ball‐milled Y2Ba1Cu1O5 phase

Record critical current densities in IG processed bulk YBa2Cu3Oy fabricated using ball‐milled Y2Ba1Cu1O5 phase

Reliable single grain growth of (RE)BCO bulk superconductors with enhanced superconducting properties

Secondary phase particles in bulk, infiltration-growth processed YBCO investigated by transmission Kikuchi diffraction and TEM

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Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase

Record critical current densities in IG processed bulk YBa₂Cu₃O_y fabricated using ball‐milled Y₂Ba₁Cu₁O₅ phase