Subsolidus relations in the La[sub 2]O[sub 3]-CuO-CaO phase diagram and the La[sub 2]O[sub 3]-CuO binary join

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07119.x· OSTI ID:6889309

Skakle, J M.S.; West, A R ^[1]

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1. Univ. of Aberdeen (United Kingdom). Dept. of Chemistry

The phase diagram for the CuO-rich part of the La[sub 2]O[sub 3]-CuO join was redetermined. La[sub 2]Cu[sub 2]O[sub 5] was found to have a lower limit of stability at 1,002 [+-] 5 C and an incongruent melting temperature of [approximately] 1,035 C. La[sub 8]Cu[sub 7]O[sub 19] had both a lower (1,012 [+-] 5 C) and an upper (1,027 [+-] 5 C) limit of stability. Subsolidus phase relations were studied in the La[sub 2]O[sub 3]-CuO-CaO system at 1,000, 1,020, and 1050 C in air. Two ternary phases, La[sub 1.9]Ca[sub 1.1]Cu[sub 2]O[sub 5.9] and LaCa[sub 2]Cu[sub 5]O[sub 8.6], were stable at these temperatures, with three binary phases, Ca[sub 2]CuO[sub 3], CaCu[sub 2]O[sub 3], and La[sub 2]CuO[sub 4]. La[sub 2]Cu[sub 2]O[sub 5] and La[sub 8]Cu[sub 7]O[sub 19] were stable only at 1,020 C, and did not support solid-solution formation.

• OSTI ID: 6889309
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:8; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
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CHALCOGENIDES
COPPER COMPOUNDS
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MIXTURES
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OXIDES
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