Phase equilibria of the SrO-CaO-CuO system at 950 C in 1 atm of oxygen and at 10 kbar

Journal Article · Thu Nov 30 23:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb07970.x· OSTI ID:177982

George, E; Elthon, D; Meen, J K ^[1]

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1. Univ. of Houston, TX (United States)

Phase equilibria in the CuO-rich ({ge} 33% CuO) portion of the SrO-CaO-CuO system have been determined at 950 C in 1 atm of pure oxygen and at 10 kbar (1 bar = 10{sup 5} Pa). Three solid-solution series occur under these conditions. There is a complete solid solution between the Ca{sub 2}CuO{sub 3} and Sr{sub 2}CuO{sub 3} endmembers at both 1 atm and 10 kbar, as has been previously noted in experiments conducted in air. Another solid-solution series extends continuously between SrCuO{sub 2} and (Sr{sub 0.38}Ca{sub 0.62})CuO{sub 2} in 1 atm of oxygen, but is limited to between SrCuO{sub 2} and (Sr{sub 0.64}Ca{sub 0.36})CuO{sub 2} at 10 kbar. At 10 kbar, more Ca-rich phases int his solid-solution series are not stable, but (Sr{sub 0.3}Ca{sub 0.7})CuO{sub 2} and (Sr{sub 0.1--0.16}Ca{sub 0.9--0.84})CuO{sub 2} are stable at 1 atm. The third solid-solution series ranges between Sr{sub 14}Cu{sub 24}O{sub 38} and (Sr{sub 0.41}Ca{sub 0.59}){sub 14}Cu{sub 24}O{sub 38} in1 atm of oxygen; the Ca-rich limit of this solid solution changes only slightly to (Sr{sub 0.39}Ca{sub 0.61}){sub 14}Cu{sub 24}O{sub 38} at 10 kbar.

• Sponsoring Organization: USDOE
• OSTI ID: 177982
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
COPPER OXIDES
ELECTRON MICROPROBE ANALYSIS
GOLD
OXYGEN
PHASE STUDIES
SAMPLE PREPARATION
SOLID SOLUTIONS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
VERY HIGH PRESSURE