Acta Metall Sin  1993, Vol. 29 Issue (5): 41-48    DOI:

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SOLIDIFIED PRODUCT FROM Bi-Sr-Ca-Cu-O MELT AND ITS TRANSFORMATION INTO SUPERCONDUCTOR

HU Zhuangqi;GE Yunlong;WANG Yongzhong;QIAO Guiwe Institute of Metal Research; Academia Sinica; ShenyangZHANG Cheng;Institute of Metal Research;Academia Sinica ;Shenyang 110015

HU Zhuangqi;GE Yunlong;WANG Yongzhong;QIAO Guiwe Institute of Metal Research; Academia Sinica; ShenyangZHANG Cheng;Institute of Metal Research;Academia Sinica ;Shenyang 110015. SOLIDIFIED PRODUCT FROM Bi-Sr-Ca-Cu-O MELT AND ITS TRANSFORMATION INTO SUPERCONDUCTOR. Acta Metall Sin, 1993, 29(5): 41-48.

Abstract References Related Articles Recommended Metrics Download:  PDF(888KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The Bi_2(Sr, Ca)_3Cu_2O_x system superconductor was prepared by different melt-ing procedures and after treatment. The effects of cooling rate, annealing temperature andtime, as well as melting procedures on phase transformation were investigated. The structureand properties were examined by X-ray diffraction, optical microscopy, EPMA, DTA, TGAand measurements of electric and magnetic properties. When the melt of nominal composition Bi_2(Sr, Ca)_3Cu_2O_x solidified in air, the Bi_2(Sr, Ca)_3Cu_2O_(8+δ)(2212) superconductive phaseis stable, the easily solidified product including Bi_2(Sr, Ca)_2CuO_(6+δ)(2201) phase is metas-table, and another may by amorphous if rapidly quenched. The last two may be transformedinto 2212 phase by after treatment with an optimal annealing temperature ranging 780-870℃. While 2201 phase, prepared by the laser floating zone melting method, may easily betransformed into 2212 phase with layer or filament in shape which is favourable to improvethe links among superconductive grains and critic current density. Key words:  Bi system superconductor      melt      stability      phase transformation      Received:  18 May 1993      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1993/V29/I5/41 1 Torrance J B, Tokura Y, Laplaca S J, Huang T C, Savog R J. Solid State Commun, 1988; 66: 703 2 Tarason J M, Lepage Y, Greene L H, Bagley B G, Barboux P, Huang D M, Hull G W, McKinnan W R, Giroud M. Phys Rev, 1988; B38: 2504 3 Takei H, Koike M, Takeya H, Suzuki K, Ichihara M. Jpn J Appl Phys, 1989; 28: 1193 4 Liu R S, Huang Y T, Jiang J M, Wu P T, Chang C. Jpn J Appl Phys, 1989; 28: 395 5 Gazit D, Peszkin P N, Moulton L V, Feigelson R S. 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