Comprehensive investigation on microstructural and transport properties of electrophoretically deposited Bi2Sr2CaCu2O8+δ/silver composite tapes with various heat treatment conditions

Sunli, Huang; Dew‐Hughes, D.

doi:10.1016/s0921-4534(99)00290-7

Cited by 6 publications

(2 citation statements)

References 37 publications

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“…Ag-alloy sheathed Bi 2 Sr 2 CaCu 2 O x (Bi2212) superconductors produced via the powder-in-tube (PIT) process are promising for low temperature, high magnetic field applications and there is a significant effort to improve the critical current density (J c ) in round wires [1][2][3][4][5][6][7][8][9][10]. At present, Bi2212 wires are primarily heat treated using the partial melt process (PMP), which consists of heating the wire above its peritectic melt temperature, cooling to a temperature below T solidus , and isothermal annealing for an extended period [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Liu

Schwartz

2012

Supercond. Sci. Technol.

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Here we study the effects of varying split-melt processing (SMP) heat treatment temperatures on multifilamentary Bi 2 Sr 2 CaCu 2 O x (Bi2212) wires to understand the factors that influence the electrical transport properties. Sharp threshold behaviors result in an order-of-magnitude difference in critical current density and distinct difference in magnetization behavior. Quantitative image analysis of SEM micrographs shows a strong correlation between the content of 2-4 µm interfilamentary bridges and electrical performance. Avrami analysis of re-solidification indicates that Bi2212 grain nucleation is heterogeneous and site-saturation limited, with a transition in the reaction mechanism corresponding to the depletion of liquid. During the first SMP heat treatment, oxygen is fully recovered, accelerating Bi2201 and/or Bi2212 phase nucleation. Large, flat Bi2201 grains form from the Bi2201 liquid at the start of the second heat treatment and subsequently act as Bi2212 grain nucleation sites. During cooling from high temperature, Bi2212 grains form via a solid/liquid reaction that is enhanced by the liquid, that facilitates second phase dissolution and cation diffusion. At lower processing temperatures, and when the liquid is depleted, Bi2212 grain growth is from a slow solid-state reaction.

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Section: Introductionmentioning

confidence: 99%

Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Liu

Schwartz

2012

Supercond. Sci. Technol.

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“…The melt-solidification technique, for example, improves the c-axis grain alignment and significantly enhances the J c -B characteristics [1]. However, almost all studies achieved the enhancement of the 0953-2048/04/010029+06$30.00 © 2004 IOP Publishing Ltd Printed in the UK J c -B characteristics by improving the influence of extrinsic factors [8][9][10]. On the other hand, only a few studies have succeeded in enhancing the J c -B characteristics of Bi-2212 tapes by controlling the intrinsic electromagnetic behaviour.…”

Section: Introductionmentioning

confidence: 99%

Performance tuning and improvement ofJ_c–Bcharacteristics for Bi-2212/Ag tapes by controlling the excess oxygen content

Nakane¹,

Matsumoto²,

Kitaguchi³

et al. 2003

Supercond. Sci. Technol.

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The dependence of the Jc value on applied magnetic fields (Jc–B characteristics) is investigated for Bi-2212/Ag tapes prepared by the melt-solidification method with respect to the effect of annealing after heat treatment (post-annealing). The results of the present work show that annealing under a high-oxygen partial-pressure and low-temperature condition enhances the Jc–B characteristics of Bi-2212/Ag tapes, and the sample annealed under a condition of p(O2) = 1 atm and 300 °C exhibited the highest Jc–B characteristics. In this case, no change in microstructure was observed; however, the Tc value and c-axis length of the Bi-2212 layer apparently decreased by the oxygenation resulting from post-annealing. Therefore, the improvement of the Jc–B characteristics is considered to be due to the increase in the excess oxygen content of the parent oxide layer in the tape sample, i.e. the decrease in the electromagnetic anisotropy of the Bi-2212 phase by the increase in the hole doping level. Based on this result, we also succeeded in the reversible control of the Jc–B characteristics for the Bi-2212/Ag tape by post-annealing. Furthermore, it is also revealed that the oxygenation by post-annealing restores the Jc–B characteristics of the Bi-2212/Ag sample with a good microstructure and less oxygen content. This means that the Bi-2212/Ag tape with low Jc–B characteristics should not be completely dismissed as hopeless. It is concluded that post-annealing after heat treatment is an indispensable process for the systematic investigation of Bi-2212/Ag tapes.

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Growth of superconducting Bi2Sr2CaCu2O8+δ films by sedimentation deposition and liquid phase sintering and annealing technique

Manahan

Sarmago

2006

Physica C: Superconductivity and its Applications

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Comprehensive investigation on microstructural and transport properties of electrophoretically deposited Bi2Sr2CaCu2O8+δ/silver composite tapes with various heat treatment conditions

Cited by 6 publications

References 37 publications

Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Performance tuning and improvement ofJ_c–Bcharacteristics for Bi-2212/Ag tapes by controlling the excess oxygen content

Growth of superconducting Bi2Sr2CaCu2O8+δ films by sedimentation deposition and liquid phase sintering and annealing technique

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Comprehensive investigation on microstructural and transport properties of electrophoretically deposited Bi2Sr2CaCu2O8+δ/silver composite tapes with various heat treatment conditions

Cited by 6 publications

References 37 publications

Influencing factors on the electrical transport properties of split-melt processed Bi2Sr2CaCu2Oxround wires

Influencing factors on the electrical transport properties of split-melt processed Bi2Sr2CaCu2Oxround wires

Performance tuning and improvement ofJc–Bcharacteristics for Bi-2212/Ag tapes by controlling the excess oxygen content

Growth of superconducting Bi2Sr2CaCu2O8+δ films by sedimentation deposition and liquid phase sintering and annealing technique

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Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Influencing factors on the electrical transport properties of split-melt processed Bi₂Sr₂CaCu₂O_xround wires

Performance tuning and improvement ofJ_c–Bcharacteristics for Bi-2212/Ag tapes by controlling the excess oxygen content