Phase diagram of the system Bi1.6Pb0.4Sr2CuO6-CaCuO2 between 825°C and 1100°C

Strobel, Pierre; Tolédano, J. C.; Morin, D.; Schneck, J.; Vacquier, G.; Monnereau, O.; Primot, J.; Fournier, T.

doi:10.1016/0921-4534(92)90100-q

Cited by 81 publications

(41 citation statements)

References 26 publications

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“…According to the phase diagram proposed by Strobel et al [29], between 860°C and 876°C the Bi,Pb(2223) phase should coexist with the Bi(2212) phase and some liquid phase before melting incongruently into Bi(2201), cuprates and liquid phase. As pointed out by Sastry et al [30] and confirmed by Park et al [31], the Bi,Pb(2223) phase is a solid solution, and therefore the melting temperature covers quite a wide range instead of occurring at a sharp point.…”

Section: (B)mentioning

confidence: 99%

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀

Giannini¹,

Savysyuk²,

Garnier³

et al. 2002

Supercond. Sci. Technol.

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The decomposition and the re-formation of the (Bi, Pb)2Sr2Ca2Cu3O10+δ (Bi, Pb(2223)) phase have been investigated in situ by means of high-temperature neutron diffraction, both in sintered bulk samples and in Ag-sheathed monofilamentary tapes. Several decomposition experiments were performed at various temperatures and under various annealing atmospheres, under flowing gas as well as in sealed tubes, in order to study the appropriate conditions for Bi,Pb(2223) formation from the melt. The Bi,Pb(2223) phase was found to melt incongruently into (Ca, Sr)2CuO3, (Sr, Ca)14Cu24O41 and a Pb,Bi-rich liquid phase. Phase re-formation after melting was successfully obtained both in bulk samples and in Ag-sheathed tapes. The possibility of crystallizing the Bi,Pb(2223) phase from the melt was found to be extremely sensitive to the temperature and strongly dependent on the Pb losses. The study of the mass losses due to Pb evaporation was complemented by thermogravimetric analysis which proved that Pb losses are responsible for moving away from equilibrium and therefore hinder the re-formation of the Bi,Pb(2223) phase from the melt. Thanks to the full pattern profile refinement, a quantitative phase analysis was carried out as a function of time and temperature and the role of the secondary phases was investigated. Lattice distortions and/or transitions were found to occur at high temperature in Bi,Pb(2223), Bi,Pb(2212), (Ca, Sr)2CuO3 and (Sr, Ca)14Cu24O41, due to cation diffusion and stoichiometry changes. The results indicate that it is possible to form the Bi,Pb(2223) phase from a liquid close to equilibrium conditions, such as Bi(2212) and Bi(2201), and open new unexplored perspectives for high-quality Ag-sheathed Bi,Pb(2223) tape processing.

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Section: (B)mentioning

confidence: 99%

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀

Giannini¹,

Savysyuk²,

Garnier³

et al. 2002

Supercond. Sci. Technol.

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“…[22,23]. The solidification of Bi2212 from the melt requires a precise control of the temperature and composition.…”

Section: T(°c)mentioning

confidence: 99%

“…Figure 4. Part of the phase diagram of Bi1.6Pb0.4Sr2Can-1CunOx as described in [23] for n varying between 1.5 and 3 and temperatures between 800 and 950°C.Phase {1} Bi2Sr2Ca0Cu1Ox (n=1) ; phase {2} Bi2Sr2Ca1Cu2Ox (n=2) ; phase {3} Bi2Sr2Ca2Cu3Ox (n=3); phase {2:1} (Sr,Ca)2Cu1 ;phase {14:24} (Sr,Ca)14Cu24 ; phase {1:2} (Sr,Ca)1Cu2.…”

Section: T(°c)mentioning

confidence: 99%

Magnetic Texturing of High-Tc Superconductors

Porcar¹,

Rango²,

Bourgault³

et al. 2012

Superconductors - Materials, Properties and Applications

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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%

“…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. Strobel et al [77,78] [56,80] discussed isothermal sections at 850 ЊC and 865 ЊC, using CuO (mole fraction fixed at 37 %), SrO, CaO and (Bi/Pb) 2 O 3 as components. MacManus-Driscoll and Yi [86] reported the phase equilibria near (Bi, Pb)-2223 as a function of oxygen partial pressure.…”

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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Phase diagram of the system Bi1.6Pb0.4Sr2CuO6-CaCuO2 between 825°C and 1100°C

Cited by 81 publications

References 26 publications

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀

Magnetic Texturing of High-Tc Superconductors

Phase Equilibria Relationships of High-Tc Superconductors

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Phase diagram of the system Bi1.6Pb0.4Sr2CuO6-CaCuO2 between 825°C and 1100°C

Cited by 81 publications

References 26 publications

Reversible melting and equilibrium phase formation of (Bi, Pb)2Sr2Ca2Cu3O10

Reversible melting and equilibrium phase formation of (Bi, Pb)2Sr2Ca2Cu3O10

Magnetic Texturing of High-Tc Superconductors

Phase Equilibria Relationships of High-Tc Superconductors

Contact Info

Product

Resources

About

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀

Reversible melting and equilibrium phase formation of (Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀