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Phase Equilibria in the System CaO‐Yb 2 O 3
Author(s) -
BARRY THOMAS L.,
STUBICAN V. S.,
ROY RUSTUM
Publication year - 1966
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.1151-2916.1966.tb13196.x
Subject(s) - solubility , metastability , phase (matter) , ytterbium , quenching (fluorescence) , mineralogy , analytical chemistry (journal) , materials science , chemistry , thermodynamics , physics , fluorescence , doping , optics , chromatography , organic chemistry , optoelectronics
Phase equilibrium relations in the system CaO‐Yb 2 O 3 were studied. Results of this work demonstrated the existence of four crystalline phases: Yb 2 O 3 .3CaO, Yb 2 O 3 .2CaO, Yb 2 O 3 °CaO, and 2Yb 2 O 3 °CaO. The 2Yb 2 O 3 °CaO phase is metastable at all temperatures and was obtained only by rapid quenching from the melt. The crystalline solubility limit of Yb a O 3 in CaO at 1850°C is slightly greater than 8 mole %, whereas no solubility of CaO in Yb 2 O 3 was detected. All four compounds have subsolidus minimums of stability and dissociate into the component oxides below 1800°C. Data are also presented for the systems CaO‐Gd 2 O 3 and CaO‐La 2 O 3 .