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Subsolidus Relations in the La 2 O 3 ─CuO─CaO Phase Diagram and the La 2 O 3 ─CuO Binary Join
Author(s) -
Skakle J. M. S.,
West Anthony R.
Publication year - 1994
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.1151-2916.1994.tb07119.x
Subject(s) - phase diagram , join (topology) , solid solution , ternary operation , phase (matter) , binary number , chemistry , thermodynamics , diagram , crystallography , mineralogy , materials science , physics , combinatorics , mathematics , statistics , organic chemistry , computer science , programming language , arithmetic
The phase diagram for the CuO‐rich part of the La 2 O 3 ─CuO join was redetermined. La 2 Cu 2 O 5 was found to have a lower limit of stability at 1002°± 5°C and an incongruent melting temperature of ∼1035°C. LagCu 7 O 19 had both a lower (1012°± 5°C) and an upper (1027°± 5°C) limit of stability. Subsolidus phase relations were studied in the La 2 O 3 ─CuO─CaO system at 1000°, 1020°, and 1050°C in air. Two ternary phases, La 1.9 Ca 1.1 Cu 2 O 5.9 and LaCa 2 Cu 3 O 8.6 , were stable at these temperatures, with three binary phases, Ca 2 CuO 3 , CaCu 2 O 3 , and La 2 CuO 4 . La 2 Cu 2 O 5 and La 8 Cu 7 O 19 were stable only at 1020°C, and did not support solid‐solution formation.