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Effect of the Melt Temperature on the Solidification Process of Liquid Garnets Ln 3 Al 5 O 12 (Ln = Dy, Y, and Lu)
Author(s) -
Gervais Monique,
Floch Sylvie,
Rifflet Jean Claude,
Coutures Juliette,
Coutures Jean Pierre
Publication year - 1992
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.1151-2916.1992.tb04408.x
Subject(s) - materials science , crystallization , metastability , differential thermal analysis , perovskite (structure) , phase (matter) , oxide , phase diagram , liquid phase , thermodynamics , mineralogy , analytical chemistry (journal) , crystallography , chemistry , metallurgy , diffraction , physics , optics , organic chemistry , chromatography
The solidification process of liquid garnets Ln 3 Al 5 O 12 (Ln = Dy, Y, Lu) was probed by differential thermal analysis. A critical temperature T clg was evidenced in the liquid. Cooling from temperatures under T clg leads to the crystallization of the single garnet phase. Cooling from temperatures above T clg leads to the solidification of a mixture of perovskite LnAlO 3 and aluminum oxide α‐Al 2 O 3 . For Ln = Y, the results are in agreement with stable and metastable phase diagrams previously proposed. The YAIO 3 melt was shown to display a critical temperature T clp also. Its metastable solidification from temperatures above T clp leads to the formation of the perovskite at around 1550°C.