Influence of Ag and Ag(In) alloy on Y-Ba-Cu-O equilibrium diagram around the Y-123 superconducting phase

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

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

We studied the chemical compatibility of Ag, Ag(In) alloy, Y2BaCuO5 (the so-called Y-211 green phase) and YBa2Cu3O7-δ (Y-123) phase in order to check if better grain growth and alignment with minimum contamination were possible during the Y-123 melt texturing. 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. DTA-TG analysis was used to investigate the influence of Ag 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 an 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 secondary phases present in the melt.

Original languageEnglish
Pages (from-to)539-549
Number of pages11
JournalJournal of Thermal Analysis and Calorimetry
Volume61
Issue number2
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

Fingerprint

Silver
silver
phase diagrams
textures
Textures
chemical compatibility
Texturing
Critical currents
Grain growth
eutectics
Differential thermal analysis
Eutectics
Superconducting materials
critical current
thermal analysis
contamination
Contamination
Metals
alignment
degradation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Influence of Ag and Ag(In) alloy on Y-Ba-Cu-O equilibrium diagram around the Y-123 superconducting phase. / Costa, G. A.; Franceschi, E. A.; Mele, Paolo.

In: Journal of Thermal Analysis and Calorimetry, Vol. 61, No. 2, 01.01.2000, p. 539-549.

Research output: Contribution to journalConference article

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N2 - We studied the chemical compatibility of Ag, Ag(In) alloy, Y2BaCuO5 (the so-called Y-211 green phase) and YBa2Cu3O7-δ (Y-123) phase in order to check if better grain growth and alignment with minimum contamination were possible during the Y-123 melt texturing. 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. DTA-TG analysis was used to investigate the influence of Ag 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 an 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 secondary phases present in the melt.

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