The effect of Bi2201 phase on the intergranular critical field and current density in Bi2223 superconductors

Guilmeau, Emmanuel; Andrzejewski, B.; Desgardin, G.

doi:10.1016/s0921-4534(01)01207-2

Cited by 18 publications

(16 citation statements)

References 29 publications

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“…Magnetic measurements give rather information, which allows estimating the values of intergranular critical current density. It was estimated on the basis of the Bean model for a rectangular rod [8,10]. The largest critical current at 5 K (about 5x10 3 A/cm 2 ) was obtained for the sample annealed at 850 °C for 43 h. It is comparable to that of 2212 and 2223 ceramics [10].…”

Section: Critical Currentmentioning

confidence: 87%

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Gazda

Kusz

Pietosa

et al. 2005

phys. stat. sol. (c)

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In this work we present the influence of annealing conditions on superconducting properties of (Bi,Pb)-SrCa-Cu-O high temperature superconductors prepared by the glass-ceramic method. Superconducting (Bi,Pb)-Sr-Ca-Cu-O samples were obtained by annealing of amorphous (Bi 0.8 Pb 0.2 ) 4 Sr 3 Ca 3 Cu 4 O x at temperatures between 750 °C and 865°C for various time intervals between 1 minute and 43 hours. The electrical and superconducting properties of the material change during annealing because oxide superconductors belonging to the bismuth family (Bi,Pb) 2 Sr 2 CuO x (2201), (Bi,Pb) 2 Sr 2 CaCu 2 O x (2212) and (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O x (2223) crystallise forming a granular metal and superconductor. Low temperature resistivity and magnetic measurements show that during the growth of crystalline phases superconducting properties develop rapidly. Measurements of magnetisation reveal that isolated grains of superconducting 2212 phase crystallise already in the first minute of annealing at 850 °C. Further development of superconducting phases leads to subsequent improvement of superconducting properties. Properties of the material (e.g. critical temperature, critical current) and kinetics of changes depend on the temperature and time of annealing. The highest critical current densities were obtained for samples annealed at 850 °C for 43 hours.

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Section: Critical Currentmentioning

confidence: 87%

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Gazda

Kusz

Pietosa

et al. 2005

phys. stat. sol. (c)

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“…Such a behaviour is explained by phase stability concepts. It has effectively been proved in a previous work [17] that sintering of pellets at 838…”

Section: J Ct and Phase Transformation Dynamicsmentioning

confidence: 94%

“…• C for 24 h [16,17] and ground in an agate mortar. The powder was sieved at different sizes (63, 100, 200 µm), hereafter referred to as powders P63, P100 and P200, respectively.…”

Section: Methodsmentioning

confidence: 99%

Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Guilmeau

Chateigner

Noudem

2002

Supercond. Sci. Technol.

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Dense Bi2223 superconductor discs with a highly oriented structure were prepared by the sinter-forging method. A detailed investigation of the processing parameters has been carried out on the phase assemblage, the particle size of the calcined precursor powder and the sinter-forging time and temperature. A high transport critical current density, J c , was obtained from a starting powder rich in Bi2212 and secondary phases. Using fine powder, a high degree of orientation, larger than those of multifilamentary tapes, and excellent intergrain connection were observed. The optimal sinter-forging temperature was found to be in the range of 845-850• C and the transport critical current densities reached values of 12 700 A cm −2 at 77 K in self-field. The combination of textural and microstructural investigations testify that a nucleation-growth mechanism from the Bi2212 particles is responsible for the Bi2223 phase formation, rather than an intercalation process.

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“…Indeed, Mo 2 Re 3 B x lamellas embedded in the Mo 3 Re 2 B x matrix, which is normal above 6.6 K, can be regarded as a granular superconducting system. For percolating granular systems there are always two superconducting transitions [11][12][13]. First, at higher temperature a set of grains undergoes into superconducting state, next the set percolates and the grains form larger superconducting clusters at lower temperature.…”

Section: Microstructure Of the Eutecticmentioning

confidence: 99%

Superconducting Properties of Mo₂Re₃B_x-Mo₃Re₂B_xEutectic

et al. 2007

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We synthesized, for the first time, superconducting eutectic composed of two new superconducting phases, namely of Mo 2 Re 3 B x and of Mo 3 Re 2 B x (where x ≈ 1) and investigated its basic transport, magnetic, and microwave properties. The transition temperatures T c were equal to 6.6 K and to 8.7 K for Mo3Re2Bx and Mo2Re3Bx compound, respectively. The phases present in the eutectic were identified by means of energy dispersion spectroscopy analyses. It was also shown that the two phases in the eutectic were separated by thin boron interface and formed regular network of the Josephson junctions which very effectively absorbed microwave energy.

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The effect of Bi2201 phase on the intergranular critical field and current density in Bi2223 superconductors

Cited by 18 publications

References 29 publications

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Superconducting Properties of Mo₂Re₃B_x-Mo₃Re₂B_xEutectic

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The effect of Bi2201 phase on the intergranular critical field and current density in Bi2223 superconductors

Cited by 18 publications

References 29 publications

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Effect of preparation conditions on superconducting properties of (Bi,Pb)‐Sr‐Ca‐Cu‐O glass‐ceramics

Sinter-forging of strongly textured Bi2223 discs with largeJcs: nucleation and growth of Bi2223 from Bi2212 crystallites

Superconducting Properties of Mo2Re3Bx-Mo3Re2BxEutectic

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Resources

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Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Superconducting Properties of Mo₂Re₃B_x-Mo₃Re₂B_xEutectic