Facts and artifacts of TEM specimen preparation for YBa2Cu3O7-x superconductors

M. St Louis-Weber*, V. P. Dravid, U. Balachandran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this study, transmission electron microscopy (TEM) specimens of polycrystalline YBa2Cu3O7-x (YBCO) superconductors were prepared by a variety of common techniques: crushing, ion beam thinning, and electrochemical-jet-polishing. Experimental techniques employed in the characterization of these specimens were SQUID measurements, transmission electron energy loss spectroscopy (EELS) analysis, and secondary ion mapping. In addition, a Monte Carlo computer simulation, known as transport of ions in matter (TRIM), was implemented to model the damage introduced during ion milling. Not surprisingly, the results suggest that oxygen stoichiometry of YBCO depends heavily upon the TEM specimen-preparation technique utilized. Crushing is the most optimal technique. The next most favorable technique is ion beam thinning at liquid-nitrogen temperature with low ion energy. Electrochemical-jet-polishing is promising, but care must be taken to remove residual surface contaminants deposited by the electrolyte solution. These results suggest the need for post-TEM specimen-preparation treatments, such as ozone annealing, to facilitate reoxygenation of the as-prepared TEM specimens.

Original languageEnglish (US)
Pages (from-to)273-280
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume243
Issue number3-4
DOIs
StatePublished - Mar 1 1995

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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