Raman and infrared spectroscopy of YBa2Cu3O7-δ-BaPbO3 composites

Ji Yeon Kim, Su Young Lee, In Sang Yang, T. G. Lee, S. S. Yom, Kibum Kim, Jae Hoon Kim

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We present results of Raman and infrared spectroscopic studies of the composite system of superconducting YBa2Cu3O7-δ and metallic BaPbO3, with the BaPbO3 fraction ranging from 5 to 30 in weight. The Raman spectra of the YBa2Cu3O7-δ grains in the composite system are typical of well-oxygenated YBa2Cu3O7-δ bulk single crystals, even up to the grain boundaries, independent of the BaPbO3 fraction. We have also performed infrared reflectivity measurements and have identified the major c-axis transverse-optical phonons of YBa2Cu3O7-δ, consistent with the single-crystal data, confirming that the constituent YBa2Cu3O7-δ crystallites are fully oxygenated. The absence of mode splitting suggests that the crystal symmetry of YBa2Cu3O7-δ grains remains the same as that of bulk single crystals. No phonons indicative of other YBa2Cu3O7- or BaPbO3-related impurity phases, such as YBa2Cu3O6, Y2BaCuO5, and Ba2PbO4, have been detected in our Raman and infrared spectra. All these optical features clearly indicate that YBa2Cu3O7-δ is well separated from BaPbO3 and that BaPbO3 is an excellent additive material for the synthesis of YBa2Cu3O7-δ bulk materials.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
StatePublished - 1 Nov 1998


  • BaPbO
  • Infrared spectroscopy
  • Intergranular material
  • Raman spectroscopy
  • YBaCuO


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