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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tampieri, A. Celotti, G. Calestani, G. |
| Copyright Year | 2002 |
| Abstract | Bulk BSCCO(2223) was prepared by a multi-step process (high cold pressing+pressureless sintering+hot-forging): the final density of the samples exceeds 95% and the orientation factor increases up to /spl ap/86%. It was found that the process phenomenology is strictly linked to the starting powder stoichiometry and characteristics: when composition is very near to the theoretical (2223), effects of secondary phase extrusion are observed during hot-forging, yielding a purification and inhibition of (2212) formation, accompanied by an appreciable increase of J/sub c/ with respect to hot-pressed samples. When the Ca/Sr ratio is considerably >1, recrystallisation of (2223) from the liquid takes place, with a remarkable improvement of critical current density (J/sub c/>10/sup 4/ A/cm/sup 2/). In this case, the non-superconducting secondary phases act as an intrinsic oxygen reservoir. Finally, when composition diverges even more from (2223) (Ca/Sr/spl Gt/1 and Cu excess), the formation of too many precipitates of non-superconducting phases hinders the texturing process and more in general deteriorates the intergranular properties. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 2010 |
| Ending Page | 2013 |
| Page Count | 4 |
| File Size | 400642 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 9 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Bismuth compounds Superconductivity Powders Frequency Pressing Critical current density Temperature Performance evaluation X-ray diffraction Chemical analysis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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