Space group and chemical analysis of Y2BaCuO5-x by convergent beam electron diffraction and x-ray energy-dispersive spectroscopy

Mansfield, John F.; Chevacharoenkul, Sopa; Kingon, Angus I.
September 1987
Applied Physics Letters;9/28/1987, Vol. 51 Issue 13, p1035
Academic Journal
The results of analyses of chemistry and microstructure of one of the secondary phases commonly observed in samples of the new high-temperature superconductors are reported. The crystal structure has been examined by convergent beam electron diffraction and is confirmed to be orthorhombic, with space group Pbnm and lattice parameters a=0.71 nm, b=1.22 nm, and c=0.56 nm. The stoichiometry of the metal components was found by x-ray energy-dispersive spectroscopy to be Y1.0Ba0.5Cu0.5, which leads us to postulate that this phase is Y2BaCuO5-x.


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