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Related Experiment Videos

Light element analysis in oxycarbonate superconductors using EELS.

K Kimoto1, Y Anan, T Asaka

  • 1Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, Japan. KIMOTO.Koji@nims.go.jp

Journal of Electron Microscopy
|October 11, 2001
PubMed
Summary
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This study reveals that carbon and nitrogen in oxycarbonate superconductors exist as carbonate (CO3) and nitrate (NO3) groups, respectively. Detector-gain corrected electron energy-loss spectroscopy (EELS) precisely identified these distinct chemical states.

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Superconductivity

Background:

  • Oxycarbonate superconductors ((Cu,N,C)Sr2CaCu2Oy) are advanced materials with potential applications.
  • Accurate elemental and chemical state analysis is crucial for understanding their properties.

Purpose of the Study:

  • To perform highly sensitive elemental analysis of an oxycarbonate superconductor.
  • To precisely determine the chemical states of carbon and nitrogen within the material.
  • To interpret the observed differences in nitrogen and carbon electronic structures.

Main Methods:

  • Transmission electron microscopy-electron energy-loss spectroscopy (TEM-EELS) with detector-gain correction.
  • Analysis of energy-loss near edge structures (ELNESs) for carbon and nitrogen K-edges.

Related Experiment Videos

  • Theoretical interpretation using DV-Xalpha simulations.

    • Main Results:

    • Detector-gain correction enabled precise elemental analysis and ELNES measurements.
    • Carbon was identified as carbonate (CO3) groups, evidenced by its K-edge ELNES matching CaCO3.
    • Nitrogen was identified as nitrate (NO3) groups, with its ELNES similar to Sr(NO3)2.
    • Distinct differences in nitrogen and carbon ELNES were observed despite similar atomic arrangements.

    Conclusions:

    • The chemical states of carbon and nitrogen in the oxycarbonate superconductor have been definitively identified as CO3 and NO3 groups.
    • The study highlights the utility of gain-corrected TEM-EELS for detailed chemical analysis of complex materials.
    • DV-Xalpha simulations provide insights into the electronic structure differences between carbonate and nitrate groups in this superconductor.