Sinter-forged (Bi, Pb)2Sr2Ca2Cu3Oxsuperconductors

Nan, Ce‐Wen; Biondo, A. C.; Dorris, S. E.; Goretta, K. C.; Lanagan, Michael T.; Youngdahl, C. A.; Poeppel, R.B.

doi:10.1088/0953-2048/6/9/005

Cited by 47 publications

(15 citation statements)

References 19 publications

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“…High-quality bulk specimens with high J c ͑Ͼ1000 A/cm 2 at 77 K͒ have been fabricated by sinter forging. 12 Large bars with good mechanical integrity can be easily cut to produce controlled defects. Another advantage is that the BSCCO/Ag bond was fabricated separately, allowing contact resistance to be varied in a separate heat treatment step.…”

Section: A Experimental Proceduresmentioning

confidence: 99%

Modeling voltage distribution and current limit in Ag/Bi2Sr2Can−1CunO2n+4

Fang

Danyluk

et al. 1996

Journal of Applied Physics

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Limitations on the critical current density in Bi2Sr2CaCu2O8 films grown on MgO(001) by metalorganic deposition Current and voltage distributions in Ag/Bi 2 Sr 2 Ca nϪ1 Cu n O 2nϩ4 ͑BSCCO͒ composites are calculated from an analytical model that is based on interfacial resistivity and geometric parameters. The model was verified by measuring the voltage distribution along Ag/Bi 2 Sr 2 Ca 2 Cu 3 O 10 bars that were fabricated by sinter forging between 400-845°C and 5-10 MPa. The results show that the solutions depend on a single dimensionless parameter, L, where L is the length of the interface and is associated with resistivity of the Ag ͑ s ͒, interfacial resistivity ͑ i ͒ between the Ag and the BSCCO, and thickness of the Ag ͑d s ͒. The voltage drop across the interface is proportional to ( i s /d s ͒ 1/2 . The model was extended for powder-in-tube tapes to examine the effects of cracking on critical current density.

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Section: A Experimental Proceduresmentioning

confidence: 99%

Modeling voltage distribution and current limit in Ag/Bi2Sr2Can−1CunO2n+4

Fang

Danyluk

et al. 1996

Journal of Applied Physics

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“…It is recognized that better J c values have been reported for a monolithic BPSCCO material, 41,42 using similar hot-pressing or hot-forging techniques at higher temperatures between 840 and 850 ± C. In this study, the solid-state processing method was developed as a routine technique for fabricating large bulk monolithic BPSCCO and (MgO) w ͞BPSCCO composite specimens with a consistent good quality for subsequent thermomechanical property studies, which are considered to be critical in the new HTS material development. In order to preserve the specimen integrity by minimizing liquid phase formation, the hot pressing was performed at relatively low temperatures up to 820 ± C.…”

Section: Effect Of Repeated Hot Pressing and Annealingmentioning

confidence: 99%

Solid-state processing and phase development of bulk (MgO)_w/BPSCCO high-temperature superconducting composite

1996

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The inherently weak mechanical properties associated with monolithic high-temperature superconductors (HTS) can be improved by introducing properly selected strong ceramic whiskers into the HTS materials. In this research, processing and superconducting properties of monolithic Pb-doped Bi-2223 (BPSCCO) and MgO whisker-reinforced BPSCCO HTS composite materials have been systematically studied. A solid-state processing method is successfully developed to fabricate the (MgO) w ͞BPSCCO composite. The HTS composite contains a dense and highly pure BPSCCO matrix phase with a preferred grain orientation, which is reinforced by MgO whiskers randomly oriented in the plane perpendicular to the hot-pressing direction. The HTS composite material is shown to exhibit excellent superconducting properties. For example, a transport J c measured at 77 K in a zero field has been obtained to exceed 5000 A͞cm 2 in a (MgO) w ͞BPSCCO composite with 10% MgO whiskers by volume. Relationships among solid-state processing variables, HTS phase development, and superconducting properties of the monolithic BPSCCO and the HTS composite are established in the paper.8

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“…Nevertheless, hot forming has proved to be quite successful for fabrication of bulk high-temperature superconductors, so long as deformation rates are low or large hydrostatic stresses are applied. [13][14][15][16][17][18][19][20] Steady-state creep data have proved to be useful in designing optimal heat treatments for superconductors and in support of more-fundamental diffusion experiments. 212-2 The hightemperature superconductors are highly complex oxides, and it is a challenge to understand their deformation responses.…”

Section: I I 1_ I_ _limentioning

confidence: 99%