Improving the critical current density in Bi-2223 wires via a reduction of the secondary phase content

Huang, Yibing; Cai, X. Y.; Holesinger, T. G.; Maroni, V.A.; Yu, D.; Parrella, R.; Rupich, M.W.; Hellstrom, E. E.; Teplitsky, M.; Venkataraman, Kartik; Otto, A.; Larbalestier, D. C.

doi:10.1109/tasc.2003.812067

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Implications for are examined. For the first time, width-normalized values that are comparable to commercial Ag-Bi-2223 multi-filamentary composite (MFC) wire [10] were obtained.…”

Section: Introductionmentioning

confidence: 89%

“…Following conversion, the water supply is turned off, starting a drying time of 3 min, prior to cooling. Excluding the drying time, annealing durations corresponding to growth rates of [5][6][7][8][9][10][11][12] were found to produce complete conversion into YBCO for thickness values ranging from 0.2-2 . Electrical resistivity values at room temperature were in the range 200-300 .…”

Section: Fast Conversion Processmentioning

confidence: 99%

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Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Feenstra

Gapud

List

et al. 2005

IEEE Trans. Appl. Supercond.

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Implementation of improved processing for BaF 2 ex situ YBCO coatings from e-beam evaporated precursors enables faster conversion with rates up to 12 A s and critical currents I c at 77 K greater than 350 A/cm-width on a RABiTS template. Details of the faster processing are described and compared to an earlier slower process. A linear relation between I c and YBCO layer thickness provides evidence of new opportunities to further improve I c .

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“…Implications for are examined. For the first time, width-normalized values that are comparable to commercial Ag-Bi-2223 multi-filamentary composite (MFC) wire [10] were obtained.…”

Section: Introductionmentioning

confidence: 89%

Section: Fast Conversion Processmentioning

confidence: 99%

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Feenstra

Gapud

List

et al. 2005

IEEE Trans. Appl. Supercond.

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“…From the results of figures 3 and 6, it is considered that the higher density of 2212 intergrowths was contained in the (Bi, Pb)2223 phase formed in the early stage, and the density gradually decreased as the (Bi, Pb)2223 phase transformation proceeded. Furthermore, in [35], TEM showed that the higher density of 2212 intergrowths was contained in the (Bi, Pb)2223 phase that was furthest from the liquid phase. Based on this consideration, the model of 2212 intergrowth formation in the (Bi, Pb)2223 phase is suggested as shown in figure 7.…”

Section: Discussionmentioning

confidence: 99%

In situobservation of 2212 intergrowths in the early stages of (Bi, Pb)2223 phase formation using the synchrotron XRD technique

Nakao

Osamura

2005

Supercond. Sci. Technol.

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2212 intergrowths in the (Bi, Pb)2223 phase have been investigated using in situ high temperature synchrotron XRD technique. With a high energy synchrotron x-ray and high resolution diffractometer, we could obtain high resolution powder XRD patterns of (Bi, Pb)2223 and (Bi, Pb)2212 from the whole bulk inside the Ag-sheath. This gave us more detailed information on 2212 intergrowths in the (Bi, Pb)2223 phase than ever before. During in situ observation, the Ag-tubed precursor was kept at 1095 K with flowing Ar-7.8% O 2 mixed gas. The profiles of the diffraction peaks were analysed by Rietveld analysis to evaluate the isotropic and anisotropic lattice strain of (Bi, Pb)2223 and (Bi, Pb)2212. Considering the evolution of anisotropic lattice strain during the heat treatment, it was concluded that 2212 intergrowths in the (Bi, Pb)2223 phase are not in the untransformed region of (Bi, Pb)2212 after incommensurate intercalation, but a stacking fault-like defect contained in the (Bi, Pb)2223 phase during its nucleation and growth. A new model of 2212 intergrowth formation in the (Bi, Pb)2223 phase was suggested and discussed.

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“…Although today's (Bi, Pb)2223/Ag tapes have large transport current densities, there remains plenty of room for improvement [1].…”

Section: Introductionmentioning

confidence: 99%

The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape

Young¹,

Avgeros²,

Yang³

2004

Supercond. Sci. Technol.

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The processing of (Bi, Pb)2223 tapes has been investigated extensively since the first OPIT tapes were made in 1989. The formation of Bi-2223 is via a Pb-induced liquid phase, which is known to assist the Bi-2223 formation. However, there are many unsolved microstructural inhomogeneities and defects in current OPIT tape; consequently research has begun to focus on the role of the liquid phase. In this study differential thermal analysis results on green (Bi, Pb)2223 tape in 7.5% pp O2 give direct evidence for two phase transitions, with onset temperatures of 800 and 820 °C. XRD phase analysis on tapes heat treated for prolonged periods show two distinct secondary phase formation regions: between 800 and 820 °C; and above 820 °C. A link is drawn between the phase transitions in the initial stages of Bi-2223 formation and the long-term secondary phase formation. The relevance of these results to transport properties is discussed.

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Improving the critical current density in Bi-2223 wires via a reduction of the secondary phase content

Abstract: Index Terms-Bi-2223 tape, critical current density, high temperature superconductor, microstructure analysis.

Cited by 7 publications

References 8 publications

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

In situobservation of 2212 intergrowths in the early stages of (Bi, Pb)2223 phase formation using the synchrotron XRD technique

The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape

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Improving the critical current density in Bi-2223 wires via a reduction of the secondary phase content

Abstract: Index Terms-Bi-2223 tape, critical current density, high temperature superconductor, microstructure analysis.

Cited by 7 publications

References 8 publications

Critical Currents&lt;tex&gt;$rm I_rm c(77 rm K)≫350 rm A/cm$&lt;/tex&gt;-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Critical Currents&lt;tex&gt;$rm I_rm c(77 rm K)≫350 rm A/cm$&lt;/tex&gt;-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

In situobservation of 2212 intergrowths in the early stages of (Bi, Pb)2223 phase formation using the synchrotron XRD technique

The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape

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Product

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Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process