Preparation of superconducting Ba-Gd-Cu-O and Ba-Yb-Cu-O ceramics by the melt quenching method

Komatsu, Takayuki; Ohki, Tomohiro; Imai, Kiyokazu; Matusita, Kazumasa

doi:10.1007/bf00720233

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Solidification Studies2

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1990

1991

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Cited by 2 publications

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“…The molten 2223 mixture was splat-quenched onto copper surfaces preheated to about 200 ~ , which helped to improve the mechanical integrity of the glass [46], the initial crystallization of which occurred at temperatures of about 450 and 650 ~ , producing identifiable phases of CuO, CaCu203 and BiCaSrOx. Glassformation for the sample with the 2212 composition with the low-Tc phase has been reported by several research groups [44][45][46][47][48][49]. In all cases, small amounts of extraneous phases were present.…”

Section: Solidification Studiesmentioning

confidence: 56%

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Phase diagrams, melt solidification and glass crystallization in the Bi-Ca-Sr-Cu-(O) system

Šesták

1990

Journal of Thermal Analysis

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Some aspects of the preparation of oxide superconductors are discussed as concerns the problems of weak links. Known binary phase diagrams are reviewed and redrawn. Ternary compounds and glass-formation regions are included. The crystallization and formation of superconducting phases are illustrated by means of T-T-T diagrams. The rate-controlling process of polymorphous precipitation is probably two-dimensional nucleation.

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Section: Solidification Studiesmentioning

confidence: 56%

“…The early-studied BCSCO compositions of (1, 5)112, (1,5) (1,5)12 and 1112 (doped by 0.3 AI) [43,45] exhibited a glassy state for splat-quenched samples. After annealing for 24 hrs at 820 ~ these showed a higher Tc and a sharper transition than those of the slowly cooled samples exposed to corn-parable conditions [69,70].…”

Section: Solidification Studiesmentioning

confidence: 99%