Phase Equilibria of the Calcium Oxide‐Copper Oxide System in Oxygen at 1 atm
1995; Wiley; Volume: 78; Issue: 7 Linguagem: Inglês
10.1111/j.1151-2916.1995.tb08901.x
ISSN1551-2916
AutoresChi‐Fo Tsang, James K. Meen, Don Elthon,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoPhase 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.
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