Phase diagram in the (Bi,Pb)SrCaCuO system: influence of partial constraint oxygen pressure

Mansori, Mohammed; Satre, P.; Roubin, M.; Vacquier, G.; Strobel, Pierre; Sebaoun, A.

doi:10.1016/0921-4534(94)91389-7

Cited by 4 publications

(3 citation statements)

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“…However, due to the complexity of the system and of the involved equilibria, some regions of the phase diagram have not been completely clarified and in particular the region of the 2223 peritectic decomposition. However in the vicinity of the 2223 composition the liquid, which appears at the horizontal solidus line at 856°C, is in equilibrium with five solid phases (2201, 2212, 2223, (Sr, Ca)z CU03 and (Sr, Ca)14 CUZ4 0 41 ) depending on temperature and composition [10]. However in the vicinity of the 2223 composition the liquid, which appears at the horizontal solidus line at 856°C, is in equilibrium with five solid phases (2201, 2212, 2223, (Sr, Ca)z CU03 and (Sr, Ca)14 CUZ4 0 41 ) depending on temperature and composition [10].…”

Section: -Results and Discussionmentioning

confidence: 99%

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Jc enhancement by partial melting in BSCCO 2223 ceramics

et al. 1997

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The application of partial melting techniques to the densification of BSCCO 2223 ceramics is presented. A new method has been developed, that avoids the peritectic decomposition of the 2223 phase and exploits the existence of a limited region of the phase diagram, occurring for composition richer in Ca and Cu, in which this phase is the only BSCCO phase coexisting with the liquid. This allows the densification process assisted by the liquid phase, limiting at the same time the formation of undesired intergrowths of lower To phases. In comparison with the usually adopted processes, the new method results in a dramatic decrease of the post-treatment times, which are typically limited to a few hours. By optimising the thermal as well as the temporal parameters governing a standard two-steps procedure, values of .J c of the order of 10 3 Acm-2 , at 77 K, can be obtained for a global process time not exceeding 6 hours.PACS 74.62.Bf -Effects of material synthesis, crystal structure and chemical composition. PACS 01.30.Cc -Conference proceedings.

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Section: -Results and Discussionmentioning

confidence: 99%

“…The 2201-CaCuOz pseudo binary phase diagram in the (Bi, Pb)-Sr-Ca-Cu-O system has been studied [7][8][9][10]. However, due to the complexity of the system and of the involved equilibria, some regions of the phase diagram have not been completely clarified and in particular the region of the 2223 peritectic decomposition.…”

Section: -Results and Discussionmentioning

confidence: 99%

Jc enhancement by partial melting in BSCCO 2223 ceramics

et al. 1997

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“…그러나 기존 Bi계 초전도체의 문제점은 Bi계 초 전도체 물질의 대부분이 산화물이므로 제조 공정상 목적하는 형상으로 만들기 용이하지 못하다는 것이 다. 또한 산화물 초전도 물질은 다성분계이므로 화 학 조성의 불균일성이나 산소의 결손으로 인해 초 전도 성능이 저하되는 문제점도 있다 5,6) . 기존의 고 온 초전도 제조에 주로 활용된 방법은 Ag 파이프 안에 산화물을 충진시켜 인발 및 소결을 통해 제조 하는 분말충진법이다 7) .…”

Section: 서 론unclassified

Joining Characteristics of Plasma Sprayed BSCCO Superconducting Coatings

Park

Cho²,

Ko³

et al. 2013

Journal of the Korean institute of surface engineering

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We performed plasma spraying for 2001 (Bi:Cu = 2:1), 0212 (Sr:Ca:Cu = 2:1:2) oxide powders. Bi 2 Sr 2 CaCu 2 Ox (2212) superconductor has been prepared by PMP-AT (partial melting process-annealing treatment). The 2212 phase is synthesized between Sr-Ca-Cu oxide coating layer (0212) and Bi-Cu oxide coating layer (2001) by movement of partial melted Bi on 2001 layer and the diffusion reaction (Cu, Sr, Ca) after PMP-AT. There are two different coating layers on joining process. The one is ABAB coating layers and the other is BAAB coating layers by arrangement of 2001 (A), 0212 (B) layers. We performed heat treatment these two different coating layers processes under same PMP-AT conditions. We obtained Bi-2212 superconducting layers at each experimental condition, and the result of MPMS, the critical temperature was showed about 78 K. But the microstructure images and result of EDS as each experimental variable were showed about the qualitatively different Bi-2212 superconducting phases. We also deduced the generation mechanism of Bi-2212 superconducting layer as a result of these experimental data, microstruc ture images, EDS data and phase diagram.

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