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Phase Equilibrium Studies in the System Iron Oxide‐Y 2 O 3 –Gd 2 O 3
Author(s) -
HOOK H. JERROLD
Publication year - 1962
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.1151-2916.1962.tb11171.x
Subject(s) - liquidus , yttrium , gadolinium , oxide , oxygen , analytical chemistry (journal) , materials science , partial pressure , solid solution , yttrium iron garnet , fractionation , iron oxide , phase (matter) , mineralogy , chemistry , metallurgy , alloy , physics , organic chemistry , chromatography , quantum mechanics
Equilibrium data at liquidus temperatures are presented for compositions in the quaternary system Y‐Gd‐Fe‐O in ambient atmospheres of oxygen gas (p O2 , = 760 mm Hg), air (P O2 , = 159 mm Hg), and CO 2 (p O2 variable). Incongruent melting occurred in yttrium‐iron and gadolinium‐iron garnet phases and in all intermediate garnet solid solutions in the three oxygen pressure sections studied. Fractionation in the yttrium/gadolinium ratio between oxide liquid and crystalline garnet phases in the quaternary system was not observed experimentally, indicating that unzoned (Y,Gd) 3 Fe 5 O 12 crystals may be grown from a melt without special precautions to maintain a fixed Y/Gd ratio.