Raman study of the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ

H. Chang, Z. H. He, R. L. Meng, Y. Y. Xue, C. W. Chu

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Abstract

We studied the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm-1 which are assigned to the vibrations of the interstitial oxygen in HgOδ layers and the apical oxygen in BaO layers, respectively. The 590 cm-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba1-xCaxCuO2.

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume251
Issue number1-2
DOIs
Publication statusPublished - 1995 Sep 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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