Texture and chemical composition analyses on the Hg{sub 0.66}Pb{sub 0.33}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} superconductor using the sealed quartz tube technique
- Physics Department and Centre for Materials Science, University of Hong Kong (Hong Kong)
- Physics Department, National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008 (China)
- Department of Physics and Materials Science, City University of Hong Kong (Hong Kong)
Pb-substituted Hg-based superconductor of Hg{sub 0.66}Pb{sub 0.33}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}} has been fabricated using the sealed quartz tube technique. {ital R}-{ital T} and x-ray diffraction pattern (XDP) measurements show that the specimen has a {ital T}{sub {ital c}} of 135 K and contains mainly the Hg-1223 phase. Scanning electron microscopy/energy dispersive x-ray analysis (SEM/EDX) and transmission electron microscopy/energy dispersive x-ray analysis (TEM/EDX) were employed to study the texture and chemical composition of the specimen. It is found that the specimen contains round-shaped grains with a mixture of Hg-1223, BaCuO{sub 2}, and Ca{sub 0.85}CuO{sub 2} phases, square-shaped grains with a formula of PbBa{sub 2}O{sub 3}, small single crystals with single Hg-1223 phase, and crystal-like layers with a mixture of Hg-1223 and BaCuO{sub 2} phase. We consider that though the doping of Pb can benefit the stabilization of the Hg-1223 phase, it introduces other impurity phases and textures in the specimen at the same time. {copyright} {ital 1996 Materials Research Society.}
- OSTI ID:
- 285859
- Journal Information:
- Journal of Materials Research, Vol. 11, Issue 6; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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