On crystal alignment in polycrystalline YBCO materials based on TEM observation

Fung, P. C. W.; Chow, James C. L.; Gao, J.

doi:10.1007/bf00617480

J Supercond

1993

DOI: 10.1007/bf00617480

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On crystal alignment in polycrystalline YBCO materials based on TEM observation

P. C. W. Fung

James C. L. Chow

J. Gao

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Cited by 2 publications

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“…In fact, in our previous research works regarding the polycrystalline YBCO superconductor,19 such a small (ϳ10 mm) crystal can usually be observed in the SEM morphologies. (b) EDX spectrum of the round-shaped grains in the specimen.0.66 : 0.33 : 1.98 : 2.19 : 3.31.…”

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confidence: 96%

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

et al. 1996

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Pb-substituted Hg-based superconductor of Hg 0.66 Pb 0.33 Ba 2 Ca 2 Cu 3 O y has been fabricated using the sealed quartz tube technique. R-T and x-ray diffraction pattern (XDP) measurements show that the specimen has a T c of 135 K and contains mainly the Hg-1223 phase. Scanning electron microscopy/energy dispersive x-ray analysis (SEM/EDX) and transmission electron microscopy/energy dispersive x-ray analysis (TEM/EDX) were employed to study the texture and chemical composition of the specimen. It is found that the specimen contains round-shaped grains with a mixture of Hg-1223, BaCuO 2 , and Ca 0.85 CuO 2 phases, square-shaped grains with a formula of PbBa 2 O 3 , small single crystals with single Hg-1223 phase, and crystal-like layers with a mixture of Hg-1223 and BaCuO 2 phase. We consider that though the doping of Pb can benefit the stabilization of the Hg-1223 phase, it introduces other impurity phases and textures in the specimen at the same time.

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confidence: 96%

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

et al. 1996

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An optimum heating program for fabricating MTG Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_y superconductors

Du¹,

Chow

et al. 1994

J. Mater. Res.

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Following our recent report on the successful fabrication of "stationary" MTG Bii.6Pbo.4Sr2Ca2Cu303, pellets in a simple tube furnace, we have tried many heating programs with various "crystal growth starting temperatures", Ts, and sintering temperatures, Te; the samples are sintered for 20-40 h before quenching in air. It is found that Ts-Te should be rather narrow to produce good MTG samples, and the typical value of Jc is enhanced from 100 A cm"2 (for a polycrystalline sample) to about 3 X 103 A cm"2 for our good ones. SEM and TEM results indicate that the samples are full of packs which contain highly oriented mica-like layers.

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On crystal alignment in polycrystalline YBCO materials based on TEM observation

Cited by 2 publications

References 32 publications

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

An optimum heating program for fabricating MTG Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_y superconductors

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On crystal alignment in polycrystalline YBCO materials based on TEM observation

Cited by 2 publications

References 32 publications

Texture and chemical composition analyses on the Hg0.66Pb0.33Ba2Ca2Cu3Oy superconductor using the sealed quartz tube technique

Texture and chemical composition analyses on the Hg0.66Pb0.33Ba2Ca2Cu3Oy superconductor using the sealed quartz tube technique

An optimum heating program for fabricating MTG Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductors

Contact Info

Product

Resources

About

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

Texture and chemical composition analyses on the Hg_0.66Pb_0.33Ba₂Ca₂Cu₃O_y superconductor using the sealed quartz tube technique

An optimum heating program for fabricating MTG Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_y superconductors