Measurement of local changes in oxygen concentration of YBa2Cu3Oy using electron diffraction

Z. Akase, Y. Tomokiyo, Y. Tanaka, M. Watanabe

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6 Citations (Scopus)


The local changes in oxygen concentration of high Tc superconductor YBa2Cu3Oy (Y123) were determined through three electron diffraction techniques, where y denotes the oxygen fraction in the unit cell. (1) Using the relationship between oxygen concentration and lattice parameters, a local change in y was measured from selected area electron diffraction patterns. The results show that the oxygen concentration is lower near a grain boundary compared with a central region of the grain in a sintered sample. The relative accuracy of y and the spatial resolution in this measurement is ±1.5% and several hundreds nm, respectively. (2) A local change in y was detected by comparing measured zone axis critical voltages with theoretical values. A value of y is lower in the vicinity of Y2BaCuO5 (Y211) particles in a sample prepared by the quench and melt-growth method. The accuracy of y is ±0.67% and the spatial resolution is 20-50 nm. (3) A change in y was also determined by quantitative analysis of rocking curves from convergent-beam electron diffraction patterns. The value of y decreases by 3% after electron irradiation for 300 s at 200 kV. The accuracy of y is ±0.5% and the spatial resolution is several nm when imaging plates were used in an energy-filtering transmission electron microscope with a field emission gun.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalPhysica C: Superconductivity and its applications
Issue number1
Publication statusPublished - 2000 Sep 15
Externally publishedYes

ASJC Scopus subject areas

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

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