Influence of , or additions on the microstructure and the critical current density of melt processed YBCO samples

Delamare, M. P.; Monot, I.; Wang, Jian; Provost, J.; Desgardin, G.

doi:10.1088/0953-2048/9/7/005

Cited by 72 publications

(44 citation statements)

References 24 publications

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“…undoped): homogeneously dispersed Y211 particles are embedded in the Y123 matrix. The Y211 particles are micron size due to the action of CeO 2 as a refiner of this phase in melt-grown samples [18][19][20]. The microstructures exhibited in these micrographs are very similar to the one presented in figure 2 for a fluorine-free sample.…”

Section: Resultssupporting

confidence: 55%

On rearrangements of the Haar system in the space BMO

Otyrba¹

1994

Russ. Math. Surv.

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The effects of fluorine on superconducting properties and microstructures of top-seeded melt grown YBa 2 Cu 3 O 7−δ bulks have been investigated through BaF 2 additions (up to 1 wt% BaF 2 ). DTA measurements show that the decomposition temperature is lowered when the content of BaF 2 is increased (1003 • C for the sample doped with 1 wt% BaF 2 ). The microstructures of the doped samples are similar to those observed in fluorine-free samples. In particular, a negligible effect is observed on the size of the Y211 particles. In the same way, the superconducting properties do not change with the additions of BaF 2 . DTA measurements of heavily doped compositions (up to 10 wt% BaF 2 ) show that the decomposition temperature is lowered down to 969 • C for an addition of 5 wt% BaF 2 . This makes BaF 2 additions promising to replace silver additions in welding processes.

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Section: Resultssupporting

confidence: 55%

On rearrangements of the Haar system in the space BMO

Otyrba¹

1994

Russ. Math. Surv.

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“…The non-superconducting 211 particles are widely thought to act as flux pinning sites, [35][36][37] where the defects and dislocations associated with the 211 particles in the 123 matrix are primarily responsible for the increased flux pinning. [38][39][40] It has been widely accepted that these dopants modify the liquid-phase characteristics at the properitectic stage and alter the growth behavior of the 211 particles in the liquid. 5 The size of the 211 particles in general is altered by adding few percent of dopants as e.g., PtO 2 , CeO 2 , etc., to the 123 material.…”

Section: B Microstructure/propertiesmentioning

confidence: 99%

Single-domain Yba₂Cu₃O_y thick films and fabrics prepared by an infiltration and growth process

Reddy¹,

Noudem²,

Tarka³

et al. 2001

J. Mater. Res.

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An infiltration and growth process has been developed to produce single-domain YBa 2 Cu 3 O y (123) as thick films on various substrates or as self-supporting fabrics. Commercially available Y 2 O 3 cloths of square woven or satin woven structure were infiltrated with liquid phases from a suitable source containing barium cuprates and copper oxides and subsequently converted into Y 2 BaCuO 5 (211) and -123 phases by a series of distinct peritectic reactions. Depending on the final form of 123, the Y 2 O 3 cloth was either clamped firmly at corners to produce a self-supporting 123 fabric or placed on a suitable substrate to result in a thick film coating of 123. The source material for the liquid phase being in the form of solid blocks was placed at corners of the cloth in the case of free-standing 123 fabrics. In case of the thick film configuration the liquid phase powder was spread on the surface of the Y 2 O 3 cloth. A small c-axis-oriented MgO or Nd(123) seed was used to generate an oriented 123 domain in the infiltrated fabric. The solidification process was optimized to transform the entire Y 2 O 3 fabric into a single-domain 123. The microstructure of the single domain was optimized in terms of 211 size and content for high J c . A detailed description of the process, the growth mechanism, the resulting microstructures was given, and basic superconducting properties of the new form of 123 are briefly discussed.

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“…[58,59,66,[70][71][72] have been studied principally. Among them, the influence of platinum has been particularly studied in spite of its high price.…”

Section: Use Of Additivesmentioning

confidence: 99%

The antipode theorem and points of coincidence

Гельман¹

1996

Russ. Math. Surv.

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Most of the potential applications of the high-temperature superconductors require large critical currents, much higher than those obtained using a classical sintering process. This paper reviews different processes and corresponding recent results in the field of texturing high-T c superconductors in order to align and develop the planes where the current flows easily. Different melt-textured growth methods are discussed from both theoretical and practical viewpoints, and the limitations associated with the diffusion and interface phenomena are introduced. Influence of the process parameters, as well as the microstructure of the precursors and the use of additives in order to enlarge the single domain size and to optimise the superconducting characteristics is discussed. Mechanical texturing and texturing under a magnetic field, as well as combination of both processes, are also considered. Recent results, which appear to be an important breakthrough for the industrial development because of the large crystallization rates are also mentioned.

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Influence of , or additions on the microstructure and the critical current density of melt processed YBCO samples

Cited by 72 publications

References 24 publications

On rearrangements of the Haar system in the space BMO

On rearrangements of the Haar system in the space BMO

Single-domain Yba₂Cu₃O_y thick films and fabrics prepared by an infiltration and growth process

The antipode theorem and points of coincidence

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Influence of , or additions on the microstructure and the critical current density of melt processed YBCO samples

Cited by 72 publications

References 24 publications

On rearrangements of the Haar system in the space BMO

On rearrangements of the Haar system in the space BMO

Single-domain Yba2Cu3Oy thick films and fabrics prepared by an infiltration and growth process

The antipode theorem and points of coincidence

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Product

Resources

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Single-domain Yba₂Cu₃O_y thick films and fabrics prepared by an infiltration and growth process