Structural and microstructural characterization of a high-Tc superconducting YBaSrCu3O7-δ compound

J. M. Liang*, Li Chang, H. M. Sung, P. T. Wu, L. J. Chen

*Corresponding author for this work

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10 Scopus citations


Transmission electron microscopy (TEM), energy dispersive analysis of x ray (EDS), x-ray diffraction, electrical resistance, and magnetic susceptibility measurements were applied to characterize the structure and microstructures of a high-Tc superconducting YBaSrCu3O7-δ compound. The sintered samples were found to be predominantly of a single phase with a modified perovskite structure. Combined EDS/TEM and high-resolution lattice imaging with computed image simulation data showed that the atomic ratio of Sr and Ba atoms is about unity and Ba sites in YBa2Cu 3O7-δ compound were partially substituted by Sr atoms in the three-layer perovskite structure, in agreement with the results of a previous neutron diffraction study. It was also found that the marked contrast difference in high-resolution images along [100] and [010] directions of the high-Tc oxygen-deficient superconducting crystals can be used to advantage to distinguish [100] and [010] directions of the modified perovskite structure in TEM. Lattice defects such as twins and dislocations were observed and analyzed.

Original languageEnglish
Pages (from-to)3593-3597
Number of pages5
JournalJournal of Applied Physics
Issue number7
StatePublished - 1 Oct 1988

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