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Phase Equilibria of the La 2 O 3 ‐SrO‐CuO System at 950°C and 10 kbar
Author(s) -
Geny Joel,
Meen James K.,
Elthon Don
Publication year - 1996
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.1151-2916.1996.tb08080.x
Subject(s) - solid solution , phase diagram , phase (matter) , ternary operation , analytical chemistry (journal) , ternary numeral system , crystallography , chemistry , materials science , mineralogy , metallurgy , organic chemistry , chromatography , computer science , programming language
Phase equilibria of the La 2 O 3 ‐SrO‐CuO system have been determined at 950°C and 10 kbar (1 GPa). Stable phases at the apices of the ternary phase diagram are CuO, La 2 O 3 , and SrO. Stable intermediate phases are La 2 CuO 4 in the LaO 1.5 ‐CuO binary and Sr 2 CuO 3 , SrCuO 2 , and Sr 14 Cu 24 O 41 in the CuO‐SrO binary. The La 2‐x Sr x CuO 4‐δ solid solution is stable where 0.0 ≤ x ≤ 1.3, the La 2‐x Sr 1+x Cu 2 O 6+δ solid solution is stable where 0.0 ≤ x ≤ 0.2, the La 8‐x Sr x Cu 8 O 20‐δ solid solution is stable where 1.3 ≤ x ≤ 2.7, the La x Sr 14‐x ‐Cu 24 O 41 solid solution is stable where 0 ≤ x ≤ 6, and the La 1+x Sr 2‐x Cu 2 O 5.5+δ phase is stable where 0.04 ≤ x ≤ 0.16. The La 2 O 3 ‐SrO‐CuO phase diagram at 950°C and 10 kbar is almost identical to that determined by other authors at 950°C and 1 atm, in terms of phase stability and solid‐solution ranges.