Phase stability and microstructural evolution in the system Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x}
Journal Article
·
· Journal of the American Ceramic Society
OSTI ID:684420
- Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
The dependence of the oxygen nonstoichiometry of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} (2212) on temperature and oxygen partial pressure has been determined in the temperature range of 300 to 1,000 C and the oxygen partial pressure range of 3 {times} 10{sup {minus}3} to 1 atm (1 atm = 10{sup 5} Pa). The solidus temperature of 2212 was identified by differential thermal analysis over the same ranges of temperature and oxygen partial pressure. The nature of the decomposition of 2212 was determined by thermogravimetric analysis in the temperature range of 800 to 1,000 C and oxygen partial pressure range of 3 {times} 10{sup {minus}3} tp 1 atm. Microstructural evolution was examined by quenching materials, equilibrated with atmospheres of fixed partial pressures of oxygen, at various stages in the decomposition and identifying the phases present by electron microscopy and wavelength dispersive spectroscopy. With increasing temperature, at fixed oxygen partial pressure, the decomposition of 2212 in the presence of 1.9 mol% Sr{sub 0.4}Ca{sub 0.6}CuO{sub 2} follows the sequence 2212 + Sr{sub 0.4}Ca{sub 0.6}CuO{sub 2} {yields} 2212 + Sr{sub 0.4}Ca{sub 0.6}CuO{sub 2} + Sr{sub 0.2}Ca{sub 1.8}CuO{sub 3} {yields} Sr{sub 0.5}Ca{sub 0.5}CuO{sub 2} + Sr{sub 0.3}Ca{sub 1.7}CuO{sub 3} + Sr{sub 0.5}Ca{sub 0.5}Cu{sub 2}O{sub 3} + L{sub 1} {yields} Sr{sub 0.5}Ca{sub 0.5}CuO{sub 2} + Sr{sub 0.3}Ca{sub 1.7}CuO{sub 3} + L{sub 2} {yields} L{sub 3}.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-90ER45427
- OSTI ID:
- 684420
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 82; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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