Thermodynamics for Formation of Each Stable Single Phase in Bi-superconductor Thin Films

  • Park, Yong-Pil (Department of Electrical & Electronic Eng., Dongshin University) ;
  • Kim, Gwi-Yeol (School of Information and Technology Eng., Korea University of Technology and Education)
  • Published : 2001.01.01

Abstract

High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$\_$sub/, and ozone gas pressures, PO$_3$. The correlation diagrams of the BSCCO phases appeared against T$\_$sub/ and PO$_3$ are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputtering, Bi2201 and Bi2223 phases as well as Bi2212 one come out as stable phases depending on T$\_$sub/ and PO$_3$. From these results, the thermodynamic evaluations of ΔH and ΔS, which are related with Gibbs' free energy change for single Bi2212 or Bi2223 phase are performed.

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