The influence of silver and Ag(In) alloy on Y-Ba-Cu-O equilibria around the YBa2Cu3O7-δ superconducting phase

G. A. Costa, E. A. Franceschi, P. Mele

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We investigated the effect of silver, Ag(In) alloy and Y2BaCuO5 (the so-called Y-211 green phase) on melt-textured samples of YBa2Cu3O7-δ (Y-123) phase in order to check whether better grain growth and alignment were possible. We demonstrate that the addition of silver to Y-123 always led to an enhanced texture. The typical microstructure of the composite Y-123 plus Y-211 (that is believed essential for high critical currents in these high Tc superconductors) was not disturbed by addition of silver up to 7.5 wt% while higher concentrations of metal led to a degradation of the texture. Differential thermal analysis and thermogravimetric analysis were used to investigate the influence of silver and Ag(In) alloy on the Y-Ba-Cu-O equilibria around the Y-123 phase. We found a very unexpected thermal behaviour, similar to eutectic equilibrium, when the silver concentration was increased to 35 wt%. We believe that this effect was essentially due to the increasingly higher concentration of silver that could react with the impurities present in the melt.

元の言語English
ページ(範囲)1113-1125
ページ数13
ジャーナルPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
80
発行部数5
DOI
出版物ステータスPublished - 2000 5

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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