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Controlled grain orientation at the surface of Bi2Sr2CaCu2Ox superconducting glass-ceramics

  • T. Komatsu
  • Y. Kuken
  • R. Sato
  • K. Sa Matusita
Papers

Abstract

Bi2Sr2CaCu2Ox glass with Cu+/(Cu+ + Cu2+) = 0.76 was prepared by using a conventional melt-quenching method, and crystalline phases and grain orientations at the surface of superconducting glass-ceramics obtained by annealing at various atmospheres were examined. The grain orientation of the Bi2Sr2CaCu2Ox phase (low-Tc phase) at the surface was severely affected by oxygen partial pressure in annealing. The favourable grain orientation, in which the plate-like grains of the low-Tc phase are oriented parallel to the surface plane, was first established in the samples obtained through a newly developed two-step annealing method: first annealing at 780°C in oxygen and second annealing at above 750°C in nitrogen. It was concluded that the favourable grain orientation of the low-Tc phase at the surface occurred due to the formation of a liquid phase in nitrogen.

Keywords

Oxygen Nitrogen Atmosphere Liquid Phase Partial Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • T. Komatsu
    • 1
  • Y. Kuken
    • 1
  • R. Sato
    • 1
  • K. Sa Matusita
    • 1
  1. 1.Department of ChemistryNagaoka University of TechnologyKamitomioka-cho, NagaokaJapan

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