Influence of silver cladding on the formation and alignment of the (Bi2−<i>x</i>Pb<i>x</i>)Sr2Ca2Cu3O10+δ phase

Luo, Jian; Merchant, N.; Maroni, V.A.; Riley, G. N.; Carter, W. L.

doi:10.1063/1.110778

Cited by 46 publications

(31 citation statements)

References 13 publications

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“…However, although there is no large-scale melting in a 2223-BSCCO composition composite (as there is for 2212 composites), there is liquid-assisted transformation of the 2212 phase to the 2223 phase [26]. Feng et al [24] and High et al [25] explicitly saw that Ag enhanced this phase conversion and Luo et al [18] subsequently presented evidence that liquid lies between the Ag and the BSCCO-2223 phase at short reaction times. Thus it seems reasonable to propose that the good bonding seen between BSCCO-2223 and Ag is also the result of a liquid-assisted accretion of the growing and transforming 2223 grain on to the Ag.…”

Section: Discussionmentioning

confidence: 99%

“…The influence of Ag in both YBa2Cu3OT (YBCO) and BSCCO tapes has been discussed by several groups [10][11][12][13][14][15][16][17][18]. It is widely believed that Ag positively encourages grain alignment in the Bi2Sr2CaCu2Oy (2212) and Bil.sPb0.4Sr2,0Ca2.2Cu3Ou (2223) compounds, but the mechanism by which this occurs is unclear in many respects.…”

Section: Introductionmentioning

confidence: 99%

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Texture relationships and interface structure in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes

Feng

Larbalestier

1994

Interface Sci

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We have studied the phase composition, alignment, and bonding at the Ag/Bi-Sr-Ca-Cu-O (BSCCO) interface for silver-sheathed tapes of both the 2212 and 2223 compositions which have been processed under different conditions. Strong texturing of the (001) planes of the BSCCO phases parallel to the Ag interface was seen, regardless of the Ag orientation. Short facets of non-(001) BSCCO planes accommodate local misalignments between the Ag and the (001) planes of the BSCCO phases. Whether the 2212 composites are processed by complete melting or by sintering below the melting point, there is always a residual half-layer of 2201 at the interface. By contrast, 2223 composites exhibit 2223 layers right up to the interface without any transition phases. Both compounds bond strongly to Ag and cracks, when present, occur preferentially away from the interface.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Texture relationships and interface structure in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes

Feng

Larbalestier

1994

Interface Sci

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“…Besides the content, the alignment of the (Bi,Pb)-2223 grains also has an important influence on the J c [24,27]. Figure 5 presents the texture evolution of the (Bi,Pb)-2223 grains in the mono-and 61-filament tapes with different sintering time recorded by rocking curves.…”

Section: Resultsmentioning

confidence: 98%

“…4). Nevertheless, because much more direct contacts between Ag and ceramic cores accelerate the formation of the (Bi,Pb)-2223 and the regions near the Ag sheath have a faster phase transforming rate [24,25], the 61-filament tapes therefore [26] reported that the (Bi,Pb)-2223 fraction in the mono-filament (Bi,Pb)-2223/Ag tape can reach to 90% and the J c of that achieved to 2784 A cm −2 after sintered for 20 h. The differences between the Ag-Ni sheathed and Ag sheathed (Bi,Pb)-2223 tapes will be mainly ascribed to the low diffusion of O 2 restrained by the outer Ni sheath, even if one edge of the Ni sheath is grinded off.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Properties of Ag–Ni Bimetallic Sheathed (Bi,Pb)-2223 Tapes

Chen

Liu

et al. 2012

J Supercond Nov Magn

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10-meter-long Ag-Ni bimetallic sheathed (Bi,Pb)-2223 tapes with outer nickel sheath and inner silver sheath have been successfully fabricated by the "Powder in tube" technique. Microstructure and phase evolution studies by means of SEM and XRD, as well as critical current density (J c ) measurements have been performed. It is found that the nickel sheath and dwell time in the first sintering process have great influences on the texture evolution, phase transformation and J c of the Bi-2223/Ag/Ni tapes. Monofilament (Bi,Pb)-2223 tape with a J c of 6656 A cm −2 and 61-filament tape with a J c of 12420 A cm −2 are obtained. Although using composite bimetallic sheaths can reduce production costs and improve mechanical properties of the Bi-2223 tapes, the Bi-2223 content and J c of Bi-2223/Ag/Ni tapes are relatively lower than that of traditional Bi-2223/Ag tapes. Meanwhile, due to higher Bi-2223 content and better alignment of Bi-2223 grains, tapes with 61-filament have higher J c than mono-filament tapes.

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“…The 3221 phase is referred to as the Bi-doped "451" solid solution by Daesche et al [56,80]. It was initially discovered by Kitakuchi et al [91] and studied in detail by Luo et al [92]. The Ca 2 PbO 4 (1x 20) phase was found to form an extensive solid solution with Sr 2 PbO 4 .…”

Section: Phases In Equilibrium With the Pb-2223 Phasementioning

confidence: 99%

Phase Equilibria Relationships of High-Tc Superconductors

Wong‐Ng¹

2011

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Accomplishments SummaryAs an integral part of a DOE R&D program (1987DOE R&D program ( -2007 3227-3229 (2005). During the course of this work, we developed extensive collaborations with several DOE laboratories. Our studies involved bulk materials, single crystals (e.g. Phys. Rev. B 41, 4220, 1990) and thin films (e.g. Appl. Phys. Lett, 88 102507, 2006; Appl. Phys. Lett. 90,102508, 2007). In addition, we also studied the interactions (phase equilibria and kinetics) of superconductor phases with buffer layers and substrates of the coated conductors (e.g. J. Solid State Chem., 470(5-6) [345][346][347][348][349][350][351] 2010).Various experimental challenges were successfully dealt with, including atmospheric contamination, substrate reaction, gas-phase interactions, and the complexity of multiphase products. Results were used to guide materials processing for optimal onset T c , critical current density, high-field behavior, mechanical properties, and cost/performance ratio, including the development of novel flux-pinning techniques.In addition, we have studied the theory and phenomena of phase transformation of the high T c BaR 2 Cu 3 O 6+x phases; the explanation of the trend of melting temperature of BaR 2 Cu 3 O 6+x as a function of the size of the ionic radius of R; phase formation studies of the (Pb,Bi):Sr:Ca:Cu (2212 and 2223) oxide phases.This work resulted in a number of awards and more than 150 publications. In the course of the project we were awarded the highest rating three times during the required annual DOE peer reviews. We were also given the Department of Commerce bronze awards in 2002 and in 2008.The list of publications as a result of the partial support of the DOE program is summarized in the following pages. Fifteen selected papers are attached. 46. W. Wong-Ng, E.J. Gonzalez, G.J, Piermarini, C. Wolters, and J. Schwartz, X-ray diffraction study of high T c materials under high pressures, Adv. X-Ray Anal. (CD-ROM format), 40 (1996 Since the discovery of high-T c superconducting oxides in 1986, 1 extensive research has led to a variety of prototype applications. In particular, the low-cost second generation high-T c wire and tape ͑coated conductor͒ technology 2-5 is promising for large-scale commercialization of superconductors. The coated-conductor materials are based on Ba 2 YCu 3 O 6+x ͑Y-213͒ and its lanthanide variants, Ba 2 RCu 3 O 6+x ͑R-213, R = lanthanides͒. 6,7 Major techniques for processing biaxially textured templates include the rolling-assisted biaxially textured substrate ͑so-called RABiTS͒ 2,3 and ion-beam-assisted deposition 4,5 methods. The BaF 2 ex situ process is among the leading candidates for producing long-length tapes with high performance. [8][9][10][11] Information on phase relationships in the Ba-Y-Cu-O system is critical for manufacturing of coated conductors, particularly for flux pinning applications. List of publications:Previously, we used in situ high-temperature x-ray diffraction ͑HTXRD͒ 11,12 to establish phase relations in high-T c superconductor Ba-Y...

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Influence of silver cladding on the formation and alignment of the (Bi2−xPbx)Sr2Ca2Cu3O10+δ phase

Cited by 46 publications

References 13 publications

Texture relationships and interface structure in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes

Texture relationships and interface structure in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes

Fabrication and Properties of Ag–Ni Bimetallic Sheathed (Bi,Pb)-2223 Tapes

Phase Equilibria Relationships of High-Tc Superconductors

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