Raman and thermal-stability studies on annealed HgBa2CuO4+δ

Y. T. Ren, H. Chang, Q. Xiong, Y. Y. Xue, C. W. Chu

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)

摘要

We have studied as-synthesized, vacuum-annealed and high-pressure oxygen annealed HgBa2CuO4+δ(Hg-1201) using Raman scattering. The apical-oxygen vibrational frequencies showed a slight but systematic shift (590, 591 and 587 cm-1), in agreement with the slight change in the Hg-O bond length from neutron-diffraction results. This suggested that the valence of Hg did not change significantly with oxygen content. The intensity of the ∼ 570 cm-1 peak decreased significantly after vacuum anneal and increased after high-pressure oxygen anneal, confirming the early assignment of this mode to interstitial oxygen. The thermal stability of these samples was studied by increasing laser power. High power density resulted in the decomposition of Hg-1201, mainly to BaCuO2-δ, suggesting mercury loss upon local heating. It was found that the annealed samples decomposed more easily. In addition, one kind of crystallites exhibited a 326 cm-1 broad peak, which disappeared after high-power irradiation. We propose that this extra peak may come from HgO and/or the defect oxygen O (4).

原文English
頁(從 - 到)209-215
頁數7
期刊Physica C: Superconductivity and its applications
226
發行號3-4
DOIs
出版狀態Published - 1994 六月 10

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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