Control of Y2BaCuO5 size and morphology in melt-processed YBa2Cu3O7-δ superconductor

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Important factors governing the size and the morphology of Y2BaCuO5 (Y211) at 1100 °C in air were investigated for three different starting materials having the same nominal composition of Y:Ba:Cu = 1.8:2.4:3.4, Y2BaCuO5-BaCuO2-CuO-Pt, Y2O3-BaCuO2-CuO-Pt, and melt-quenched materials from 1400 °C in a Pt crucible. With various amounts of Pt doping, the heating rate and the holding time were employed as the processing parameters. While, with the aid of Pt doping as the effective growth inhibitor, fine round Y211 grains could be obtained by simply employing a refined round Y211 precursor and a rapid healing, there were several important factors for obtaining fine acicular (or needle-like) Y211 grains as follows: (i) The Pt dopants dissolved in the liquid phase should act as the effective heterogeneous nucleation sites. (ii) Y211 grains should grow into the acicular shapes before the system reaches an equilibrium amount of Y211 in the liquid (i.e., reaction-controlled). (iii) A large amount of the liquid phase should be supplied instantly at the partial melt stage with a rapid heating.

Original languageEnglish
Pages (from-to)1611-1621
Number of pages11
JournalJournal of Materials Research
Volume10
Issue number7
Publication statusPublished - 1995 Jul
Externally publishedYes

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Superconducting materials
Doping (additives)
liquid phases
Liquids
Growth Inhibitors
heating
Crucibles
healing
crucibles
Heating rate
needles
Needles
inhibitors
Nucleation
nucleation
Heating
air
liquids
Processing
Air

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Control of Y2BaCuO5 size and morphology in melt-processed YBa2Cu3O7-δ superconductor. / Sakai, Naomichi; Yoo, S. I.; Murakami, Masato.

In: Journal of Materials Research, Vol. 10, No. 7, 07.1995, p. 1611-1621.

Research output: Contribution to journalArticle

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