Surface chemical decomposition of HgBa2 CuO4+σ by high powered laser radiation

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

研究成果: Article同行評審

14 引文 斯高帕斯(Scopus)

摘要

The Raman bands of Ba2CuO3 at 563 cm-1 and of Hg-1201 at 571 and 591 cm-1 were observed on a HgBa2CuO4+σ (Hg-1201) crystal under laser irradiation with a power of 2 to 3 mW/μm2 and at a short acquisition time of 1 s, indicating the formation of Ba2CuO3 on thesurface of the Hg-1201 crystallite. The Ba2CuO3 decomposed to BaCuO2 under higher laser irradiation. We suggest that a two-step chemical reaction occurred on the surface of the crystal. First, a HgO segment is drawn out of the crystallite, leaving a vacant plane. The crystallite then collapses, the upper part displaced by a 2 and b 2, and newe Ba-O bonds form. In this manner, the HgBa2CuO4+σ on the surface of a crystal turns into a layer of Ba2CuO3.

原文English
頁(從 - 到)15-21
頁數7
期刊Physica C: Superconductivity and its applications
248
發行號1-2
DOIs
出版狀態Published - 1995 六月 10

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程

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