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EnglishBulk YBCO samples obtained by the copptn. method show a const. and reproducible transition temp. of 92 ± 1 K together with a const. oxygen stoichiometry. The d. is approx. 90% of the theor. value and reflects a virtually pore depleted microstructure, consisting of closely interconnected twinned grains. Samples obtained from the solid state reaction of mech. mixed oxides have a d. 70-80% of the theor. value. The microstructure, even in optimum stoichiometry conditions, which are more difficult to obtain in a reproducible way, consists of large elongated twinned grains poorly interconnected. This pore dense structure is not homogeneous on a macroscale, showing locally domains of unwanted phases. The orthorhombic samples produced by copptn. are more stable. Measurements of the crit. current in progress, seem to indicate also a substantial increase of the current. [on SciFinder(R)] CAPLUS AN 1993:180984(Conference)
| Titolo: | High temperature microstructural and superconducting properties of YBa2Cu3O7-x obtained using two different processes |
| Autori: | |
| Data di pubblicazione: | 1992 |
| Abstract: | Bulk YBCO samples obtained by the copptn. method show a const. and reproducible transition temp. of 92 ± 1 K together with a const. oxygen stoichiometry. The d. is approx. 90% of the theor. value and reflects a virtually pore depleted microstructure, consisting of closely interconnected twinned grains. Samples obtained from the solid state reaction of mech. mixed oxides have a d. 70-80% of the theor. value. The microstructure, even in optimum stoichiometry conditions, which are more difficult to obtain in a reproducible way, consists of large elongated twinned grains poorly interconnected. This pore dense structure is not homogeneous on a macroscale, showing locally domains of unwanted phases. The orthorhombic samples produced by copptn. are more stable. Measurements of the crit. current in progress, seem to indicate also a substantial increase of the current. [on SciFinder(R)] CAPLUS AN 1993:180984(Conference) |
| Handle: | http://hdl.handle.net/11570/1905645 |
| Appare nelle tipologie: | 14.d.1 Abstract in Atti di convegno |
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