Publication Type:Journal Article
Source:Journal of Materials Research, Volume 4, Number 3, p.515-520 (1989)
Keywords:Gadolinium Barium Copper Alloys, Metallography–Microstructures, Microscopic Examination–Transmission Electron Microscopy, Oxide superconductors, Oxygen Annealing Effects, Sintered Superconductor Alloys, Superconducting Materials–Annealing, Superconducting transition temperature, Twinned Orthorhombic Phase, Vacuum Annealing Effects
An electron microscopy study has been carried out to characterize the microstructure of a sintered Gd-Ba-Cu-O superconductor alloy. The GdBa2Cu3O7-x phase in the oxygen annealed sample is orthorhombic while in the vacuum annealed sample it is tetragonal. It is shown that the details of the fine structure in the  zone axis convergent beam patterns can be used to distinguish between the orthorhombic form and the tetragonal form. In addition to this matrix phase, an amorphous phase is frequently observed at the triple grain junctions. Gd-rich inclusions have been observed inside the matrix phase. © 1989, Materials Research Society. All rights reserved.
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