Upper-phase stability limit of Bi-2212
- Imperial Coll., London (United Kingdom)
The upper stability line for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi-2212) was determined over the temperature range 540--800 C and the oxygen partial pressure range 1.5 {times} 10{sup 1}--7.4 {times} 10{sup {minus}3} atm using coulometric titration and high oxygen pressure annealing. The decomposition products resulting from Bi-2212 oxidation are CuO, two alkaline-earth bismuthates, and the Raveau phase, Bi{sub 11}Sr{sub 9}Cu{sub 5}O{sub y}. The main alkaline-earth bismuthate is a known phase of cation composition Bi:Sr:Ca = 2.00:2.48:1.19 (Bi:Sr:Ca {approximately} 9:11:5). The other alkaline-earth bismuthate is a minor phase of cation composition Bi:Sr:Ca = 2.00:0.53:0.39. The kinetics for Bi-2212 decomposition are very slow; e.g., at 700 C in air, the reaction is incomplete after 7 days.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 474166
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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