In situ study of equilibrium phenomena and kinetics in a BiSCCO/Ag tape

Poulsen, Henning Friis; Andersen, Lionel; Frello, T.; Prantontep, S; Andersen, N.H.; Garbe, S.; Madsen, J.; Abrahamsen, Asger Bech; Bentzon, M.D.; Zimmermann, M. v.

doi:10.1016/s0921-4534(99)00217-8

Cited by 27 publications

(22 citation statements)

References 18 publications

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“…Bi,Pb(2223) formation after partial melting in a strong magnetic field has been reported to improve density and grain alignment in bulk samples [20]. More recently, a partial reformation of Bi,Pb(2223) after melting was observed by Poulsen et al [21] by means of in-situ synchrotron X-ray diffraction. Nevertheless, the thermodynamic conditions to form Bi,Pb(2223) on cooling from a melt, like Bi(2212) and Bi(2201), are still to be found.…”

Section: Introductionmentioning

confidence: 94%

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: Introductionmentioning

confidence: 94%

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

Giannini¹,

Savysyuk²,

Garnier³

et al. 2002

Supercond. Sci. Technol.

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“…Previous work dealing with (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 /Ag tapes has demonstrated that hard x-rays are a valuable probe for studying in situ the phase transformations and microstructure evolution occurring during heat treatment in a ceramic that is clad inside a metal sheath [11][12][13][14][15][16][17][18]. Recently, Baranov et al [19] used synchrotron radiation to study the formation of MgB 2 under pressure from various precursor powder mixtures containing Mg and B or BN.…”

Section: Introductionmentioning

confidence: 99%

In situinvestigations of phase transformations in Fe-sheathed MgB₂wires

Grivel

Pinholt

Andersen

et al. 2005

Supercond. Sci. Technol.

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The phase evolution inside Fe-sheathed wires containing precursor powders consisting of a mixture of Mg and B has been studied in situ by means of x-ray diffraction with hard synchrotron radiation (90 keV). Mg was found to disappear progressively during the heating stage. At 500• C, the intensity of the Mg diffraction lines is reduced by about 20%. This effect is partly attributable to MgO formation. The MgB 2 phase was detected from 575• C. Fe 2 B was forming at the interface between the sheath and the ceramic core at sintering temperatures of 780 and 700• C, but not at 650• C. The formation rate of this phase is strongly dependent on the heat treatment temperature. Its presence can be readily detected as soon as the average interface reaction thickness exceeds 150-200 nm.

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“…For these reasons, at Risø a major effort has been put into characterizing the structural details, in order to understand the microstructural dynamics [92,93,94,95,96]. An extended summary of the results is given in [97].…”

Section: Optimization Of High-t C Superconducting Tapesmentioning

confidence: 99%

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Poulsen

2004

Springer Tracts in Modern Physics

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In situ study of equilibrium phenomena and kinetics in a BiSCCO/Ag tape

Cited by 27 publications

References 18 publications

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

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

In situinvestigations of phase transformations in Fe-sheathed MgB₂wires

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In situ study of equilibrium phenomena and kinetics in a BiSCCO/Ag tape

Cited by 27 publications

References 18 publications

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

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

In situinvestigations of phase transformations in Fe-sheathed MgB2wires

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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

In situinvestigations of phase transformations in Fe-sheathed MgB₂wires