Formation of the Liquid Phase in the System Bi‐Pb‐Sr‐Ca‐Cu‐O

Huang, Yu‐Ting; Wang, Wang-Nan; Wu, S.F.; Shei, C.Y.; Hurng, W.‐M.; Lee, Wun-Hsin; Wu, P. T.

doi:10.1111/j.1151-2916.1990.tb06486.x

Cited by 37 publications

(3 citation statements)

References 12 publications

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“…These structures reflected the recrystallization after melting. It is known that some liquid phases lead to the formation of a 2223 phase [8,9]. The presence of the liquid phase narrows the temperature windows of annealing, because re-evaporation of the elements easily take place when thin film was melted.…”

Section: Resultsmentioning

confidence: 99%

Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Mori

Koba

2019

J. Phys. Commun.

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Post-annealing of superconducting Bi 2 Sr 2 Ca n-1 Cu n O x (BSCCO) thin films deposited by sputtering is essential for obtaining a single 2223 phase. However, optimum annealing temperature is limited to a very narrow range, needing to pass liquid phase for 2223 crystallization while not exceeding reevaporation point. In this study, we optimized annealing conditions and observed the crystal growth process. As a result, single phase 2223 thin films with critical temperature of 108 K were obtained at 850°C, while mixed phase thin films of 2223 and 2212 were grown above 855°C. This is due to the reevaporation of the thin film compounds, and these results reflect the recrystallization process after melting.

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Section: Resultsmentioning

confidence: 99%

Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Mori

Koba

2019

J. Phys. Commun.

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“…Various authors have reported that the reaction corresponding to the DTA peak 344 just before melting occurs seems to be a necessary condition for growth of the 2223 phase (22)(23)(24). The region containing a liquidphase is often referredto as the region of partial melting, which can cover a temperature range of up to -30°C, beginning at the onset of melting temperature, as reported by Yamada et al …”

Section: Heat Treatment Phase Identification and Thermal Eventsmentioning

confidence: 95%

Fabrication and Characterization of High- T_cSuperconducting Continuous-Tube-Forming/Filling Bi(Pb)-2223/Ag Composites and Coils

Collings

Willis

et al. 1998

Materials and Manufacturing Processes

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“…With regard to phase diagram studies, because the Bi-Pb-Sr-Ca-Cu-O system is a five-component oxide system, a complete investigation requires extensive effort. Thus far, many studies have concentrated on small regions pertaining to the Pb-2223 phase [56,[76][77][78][79][80][81][82][83][84][85][86]. For example, Toledano et al [76] treated 2223 equilibria with reference to the quasi-quaternary (Bi 1.8 Pb 0.4 )O x -CaO-SrO-CuO system.…”

Section: Phase Equilibrium Datamentioning

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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Formation of the Liquid Phase in the System Bi‐Pb‐Sr‐Ca‐Cu‐O

Cited by 37 publications

References 12 publications

Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Fabrication and Characterization of High- T_cSuperconducting Continuous-Tube-Forming/Filling Bi(Pb)-2223/Ag Composites and Coils

Phase Equilibria Relationships of High-Tc Superconductors

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Formation of the Liquid Phase in the System Bi‐Pb‐Sr‐Ca‐Cu‐O

Cited by 37 publications

References 12 publications

Crystal growth of (Bi, Pb)2Sr2Ca2Cu3O thin films fabricated via post annealing

Crystal growth of (Bi, Pb)2Sr2Ca2Cu3O thin films fabricated via post annealing

Fabrication and Characterization of High- TcSuperconducting Continuous-Tube-Forming/Filling Bi(Pb)-2223/Ag Composites and Coils

Phase Equilibria Relationships of High-Tc Superconductors

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Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Crystal growth of (Bi, Pb)₂Sr₂Ca₂Cu₃O thin films fabricated via post annealing

Fabrication and Characterization of High- T_cSuperconducting Continuous-Tube-Forming/Filling Bi(Pb)-2223/Ag Composites and Coils