Stability of Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{+-}{delta}} thick films at elevated oxygen pressures and temperatures

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08692.x· OSTI ID:116101

Chmielewski, D H; Sandhage, K H ^[1]

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1. Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering

Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{+-}{delta}}-type compound thick films were exposed to oxygen--argon-gas mixtures (1% to 20% oxygen gas) at elevated pressures (up to 207 MPa) and temperatures (500 to 940 C) for times ranging from 5 to 96 h. At a sufficiently high oxygen fugacity and temperature, Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{+-}{delta}} decomposed via a solid-state reaction. Room-temperature X-ray diffractometry and electron probe microanalysis of decomposed films revealed the presence of Bi{sub 2}(Sr,Ca){sub 2}-Cu{sub 1}O{sub 6{+-}{omicron}}-type compound, Bi{sub 9}Sr{sub 11}Ca{sub 5}O{sub {Psi}}-type compound, and CuO. Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{+-}{delta}} decomposition was accompanied by a modest weight gain, which was consistent with an oxidation reaction. The solid-state decomposition reaction could be reversed by heat treatment of decomposed films at 860 C in pure, flowing oxygen at ambient pressure.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-90ER45427
• OSTI ID: 116101
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARGON
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
DECOMPOSITION
ELECTRON MICROPROBE ANALYSIS
OXIDATION
OXYGEN
PRESSURE DEPENDENCE
STABILITY
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
X-RAY DIFFRACTION