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Experimental Establishment of the CaAl 2 O 4 –MgO and CaAl 4 O 7 –MgO Isoplethal Sections within the Al 2 O 3 –MgO–CaO Ternary System
Author(s) -
Durán Teresa,
Serena Sara,
Pena Pilar,
Caballero Ángel,
De Aza Salvador,
De Aza Antonio H.
Publication year - 2008
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.1551-2916.2007.02126.x
Subject(s) - melting point , ternary numeral system , ternary operation , mineralogy , materials science , solid state , solid solution , phase diagram , thermodynamics , analytical chemistry (journal) , crystallography , phase (matter) , chemistry , metallurgy , physics , organic chemistry , composite material , programming language , chromatography , computer science
The isoplethal sections CaAl 2 O 4 –MgO and CaAl 4 O 7 –MgO of the Al 2 O 3 –MgO–CaO ternary system have been experimentally established at 1 bar total pressure and air of normal humidity. The sections obtained provide new data and information that are in disagreement with thermodynamic evaluations and optimizations of the Al 2 O 3 –MgO–CaO ternary system published to date. These differences arise mainly from the inclusion, or exclusion, of the binary compound Ca 12 Al 14 O 33 , mayenite, as a stable phase in the reported studies of the system. The presence or absence of this compound within the system has an important impact on the solid state and melting relationships of the whole ternary system. The present study confirms the solid‐state compatibility CaAl 2 O 4 –MgO and CaAl 2 O 4 –MgO–MgAl 2 O 4 up to 1372°± 2°C, the peritectic melting point of the later mentioned subsystem.