Metastable states of the 2223 phase in the Bi(Pb)SrCaCuO system
Journal Article
·
· Journal of Superconductivity
- Institute of Atomic Physics, Bucharest (Romania)
By the magnetically modulated microwave absorption method (MAMMA) the authors observed the modifications induced by different calcination temperatures (between 830{degree}C and 870{degree}C) on the 2223 phase formed in a system sintered at (855 {plus_minus} 5){degree}C with the starting composition Bi{sub 1.7}Pb{sub 0.3}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y}. The presence of the 2223 in almost distinct states (consequently, multiple 2223 phases) in the same sample was observed. As the calcination temperature was increased up to 850{degrees}C, the highest temperature state of the 2223 phase intensified. Higher calcination temperatures resulted in the enhancement of other low-temperature states. The homogeneity of the 2223 phase was greatly improved by annealing the samples at 800{degree}C for 5 min in a flowing nitrogen atmosphere. The authors labeled as {open_quotes}metastable{close_quotes} the lower-temperature states having excess oxygen, which, by easily losing the supplementary oxygen under the above annealing procedure, were shifted to higher temperatures.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 457451
- Journal Information:
- Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 3 Vol. 9; ISSN JOUSEH; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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