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Phase Equilibria of the Calcium Oxide‐Copper Oxide System in Oxygen at 1 atm
Author(s) -
Tsang ChiFo,
Meen James K.,
Elthon Don
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08901.x
Subject(s) - liquidus , eutectic system , copper , copper oxide , oxide , phase diagram , oxygen , phase (matter) , calcium oxide , partial pressure , materials science , analytical chemistry (journal) , atmospheric temperature range , mineralogy , chemistry , thermodynamics , metallurgy , microstructure , chromatography , physics , organic chemistry
Phase equilibria in the CaO‐CuO system have been determined at 1 atm pressure in oxygen over the temperature range 800° to 1300 deg; C. CaO is the stable phase at the calcium‐rich end of the system. Two intermediate crystalline phases, namely Ca 2 CuO 3 and Ca 3 Cu 7 O 10 , form. Ca z CuO 3 is stable up to 1085°± 3 deg; C, where it melts incongruently to CaO + liquid (peritectic liquid has ε82% CuO). Ca 3 Cu 7 O 10 becomes stable at 977°± 3 deg; C by reaction between Ca 2 CuO 3 and CuO. Ca 3 Cu 7 O 10 melts incongruently at 1046°± 3 deg; C to Ca 2 CuO 3 + liquid (peritectic liquid has ε83% CuO). CuO is the stable copper oxide phase up to 1061°± 3 deg; C at the copper‐rich end of the system; at higher temperatures, Cu 2 O is stable until the liquidus is reached at 1121 deg; C. The binary eutectic is at 1045°± 5 deg; C, in which a liquid with 83% CuO coexists with Ca 3 Cu 7 O 10 and CuO.