Phase equilibria of the calcium oxide-copper oxide system in oxygen at 1 atm

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08901.x· OSTI ID:103616

Tsang, C F; Meen, J K; Elthon, D ^[1]

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

Phase equilibria in the CaO-CuO system have been determined at 1 atm pressure in oxygen over the temperature range 800 to 1,300 C. CaO is the stable phase at the calcium-rich end of the system. Two intermediate crystalline phases, namely Ca{sub 2}CuO{sub 3} and Ca{sub 3}Cu{sub 7}O{sub 10}, form. Ca{sub 2}CuO{sub 3} is stable up to 1,085 {+-} 3 C, where it melts incongruently to CaO + liquid (peritectic liquid has {approximately}82% CuO). Ca{sub 3}Cu{sub 7}O{sub 10} becomes stable at 977 {+-} 3 C by reaction between Ca{sub 2}CuO{sub 3} and CuO. Ca{sub 3}Cu{sub 7}O{sub 10} melts incongruently at 1,046 {+-} 3 C to Ca{sub 2}CuO{sub 3} + liquid (peritectic liquid has {approximately}83% CuO). CuO is the stable copper oxide phase up to 1,061 {+-} 3 C at the copper-rich end of the system; at higher temperatures, Cu{sub 2}O is stable until the liquidus is reached at 1,121 C. The binary eutectic is at 1,045 {+-} 5 C, in which a liquid with 83% CuO coexists with Ca{sub 3}Cu{sub 7}O{sub 10} and CuO.

• Sponsoring Organization: USDOE
• OSTI ID: 103616
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
CHEMICAL REACTION KINETICS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRON MICROPROBE ANALYSIS
EUTECTICS
GOLD
LIQUIDS
PHASE STUDIES
PLATINUM
POWDERS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION