TEM observation of intergrowth structures in the HgBa2Ca2Cu3Oy ceramic superconductor
β Scribed by C.C. Lam; S.D. Wang; H.M. Shao; G.J. Shen; J.C.L. Chow; P.C.W. Fung; S.L. Ho; H.Y. Lai; K.C. Hung
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 804 KB
- Volume
- 247
- Category
- Article
- ISSN
- 0921-4534
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β¦ Synopsis
Intergrowth structures, which occur in the HgBa2Ca2Cu3Oy ceramic superconductor, were observed by means of transmission electron microscopy (TEM). There are at least two types of intergrowth structure: Hg-1212/Hg-1223 and Hg-1223/Hg-1234. The congruence relationships for these intergrowth structures are respectively:
π SIMILAR VOLUMES
## From magnetization studies for the grain aligned HgBa2CazCu30, superconductor the temperature variation of critical current density J,(T) values was characterized by an exponential decay of the form J, a exp (-T/T,). Flux pinning was significantly greater with the peak F P, ,,,(T) shifted to h
The onset temperature ( T,) of the Meissner signal for HgBaZCa2Cu30, (which is 134 K under normal pressure) has been measured under high pressure up to 11 GPa. It is observed that T, increases with increasing pressure at the rate of dT,/dP= 2.0 K/ GPa and then dT./dPbecomes relatively small above 6
We produced the HgBa2Ca2Cu308+ x (Hg-1223) superconductors by changing the composition, mercury vapor pressure and reaction temperature. We found that the high mercury pressure is essential for the formation cf the Hg-1223 phase by preventing the decomposition of HgO at low temperature. This sample