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The Ternary System MgO‐MnO‐SiO 2
Author(s) -
GLASSER F. P.,
OSBORN E. F.
Publication year - 1960
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.1151-2916.1960.tb14327.x
Subject(s) - enstatite , solid solution , cristobalite , tridymite , phase diagram , ternary operation , materials science , phase (matter) , olivine , mineralogy , coesite , nepheline , analytical chemistry (journal) , thermodynamics , geology , chemistry , quartz , metallurgy , chondrite , computer science , tectonics , paleontology , chromatography , programming language , physics , meteorite , organic chemistry , astronomy , eclogite , subduction
A ternary phase equilibrium diagram is presented for the system Mg0‐Mn0‐Si0 2 . Two peritectic points exist at 1536° and 1538°C. at liquid compositions of (a) 32 MgO, 5 MnO, 63 SiO 2 and (b) 36 MgO, 5.5 MnO, 58.5 SO,. Each of these liquids is in equilibrium with a hodonite (Mn‐SiO,) and a high enstatite (MgSiO,) solid solution, the third crystalline phase being cristobalite (SiO 2 ) with (a) and olivine ((Mg,Mn] 2 ,Si0 4 ) with (b). Metasilicate solid solutions form a congruently melting rhodonite series in the central part of the MgSi0 3 ‐MnSi0 3 join, but melt incongruently to olivine plus liquid at the MgSiO 3 end and to tridymite plus liquid at the MnSi0 3 end. X‐ray diffraction data are given for two new high enstatite solid solution structures. Rhodonite solid solutions form a continuous structural series extending from MnSi0, to 94.5 weight % MgSi03. Continuous series of solid solutions exist between Mg,Si0 4 and Mn 2 SiO 4 and between MgO and MnO. Compositional data are given for coexisting condensed phases, and courses of crystallization are described for certain ternary mixtures. A plot is presented of variation of refractive index of glasses which form an almost colorless series in the region of the rhodonite and high enstatite fields. The quenching technique was used in the investigation, with oxygen partial pressure controlled to maintain manganese as Mn 2+ .