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Journal of Materials Science

, Volume 32, Issue 8, pp 2171–2175 | Cite as

Raman spectra of Bi–Sr–Ca–Cu–O high temperature superconductors

  • P. C THOMAS
  • M KUMAR K.
  • V. U NAIR
Article

Abstract

Two high-temperature superconducting BiSrCaCuO compounds were fabricated as Bi2.1Sr4Ca4Cu3O10+δ and Bi2Sr2Ca2Cu3O10+δ. The X-ray diffraction patterns of both the compounds show that Bi2.1Sr4Ca4Cu3O10+δ contains predominantly the high Tc 2223 phase, and Bi2Sr2Ca2Cu3O10+δ the low Tc 2212 and high Tc 2223 phases, in equal amounts. The Raman spectra of these samples exhibit broad bands in the 430–512 cm-1 region, as in the lead-substituted 2212 phase. Change in configuration due to the presence of the 2223 phase in the sample is indicated by the broadening of the 465 cm-1 line. New bands at 611 and 678 cm-1 are observed. Peaks in the 430–512 cm-1 region exhibit a softening when the temperature is reduced to 93 K.

Keywords

Raman Spectrum Broad Band High Temperature Superconductor Copper Atom Bismuth Oxide 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • P. C THOMAS
    • 1
  • M KUMAR K.
    • 1
  • V. U NAIR
    • 1
  1. 1.Department of OptoelectronicsUniversity of KeralaKariavattom TrivandrumIndia

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