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Quaternary System Al 2 O 3 –CaO–MgO–SiO 2 : II Study of the Crystallization Volume of MgAl 2 O 4
Author(s) -
Alicia Vázquez Bertha,
Caballero Ángel,
Pena Pilar
Publication year - 2005
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.1551-2916.2005.00372.x
Subject(s) - liquidus , crystallization , spinel , mineralogy , stoichiometry , impurity , analytical chemistry (journal) , materials science , annealing (glass) , solid solution , crystallography , thermodynamics , chemistry , metallurgy , physics , organic chemistry , alloy , chromatography
Solid‐state compatibility and melting relations of MgAl 2 O 4 in the quaternary system Al 2 O 3 –CaO–MgO–SiO 2 were studied by firing and quenching selected samples located in the 65 wt% MgAl 2 O 4 , plane followed by microstructural and energy dispersive X‐ray analysis. A projection of the liquidus surface of the primary crystallization volume of MgAl 2 O 4 was constructed from CaO, SiO 2 and exceeding Al 2 O 3 , not involved in stoichiometric MgAl 2 O 4 formation; those three amounts were recalculated to 100 wt%. The temperature and character of six invariant points, where four solids co‐exist with a liquid phase, were defined. One maximum point was localized and the positions of the isotherms were tentatively established. The effect of CaO, SiO 2 , and Al 2 O 3 impurities on the high temperature behavior of spinel materials was also discussed.