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Phase Equilibria of the SrO–CaO–CuO System at 950°C in 1 atm of Oxygen and at 10 kbar
Author(s) -
George Etienne,
Elthon Don,
Meen James K.
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.tb07970.x
Subject(s) - solid solution , oxygen , phase (matter) , analytical chemistry (journal) , chemistry , bar (unit) , mineralogy , organic chemistry , chromatography , physics , meteorology
Phase equilibria in the CuO‐rich (≥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 5 Pa). Three solid‐solution series occur under these conditions. There is a complete solid solution between the Ca 2 CuO 3 and Sr 2 CuO 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 2 and (Sr 0.38 Ca 0.62 )CuO 2 in 1 atm of oxygen, but is limited to between SrCuO 2 and (Sr 0.64 Ca 0.36 )CuO 2 at 10 kbar. At 10 kbar, more Ca‐rich phases in this solid‐solution series are not stable, but (Sr 0.3 Ca 0.7 )CuO 2 and (Sr 0.1–0.16 Ca 0.9–0.84 )CuO 2 are stable at 1 atm. The third solid‐solution series ranges between Sr l4 Cu 24 O 38 and (Sr 0.41 Ca O.59 ) 14 ‐Cu 24 O 38 in 1 atm of oxygen; the Ca‐rich limit of this solid solution changes only slightly to (Sr 0.39 Ca 0.61 ) 14 Cu 24 O 38 at 10 kbar.