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Coupled Experimental and Thermodynamic Optimization of the Na 2 O–FeO–Fe 2 O 3 –Al 2 O 3 System: Part 1. Phase Diagram Experiments
Author(s) -
MoosaviKhoonsari Elmira,
Hudon Pierre,
Jung InHo
Publication year - 2016
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/jace.14020
Subject(s) - phase diagram , electron microprobe , spinodal decomposition , solid solution , saturation (graph theory) , analytical chemistry (journal) , oxide , phase (matter) , miscibility , thermodynamics , materials science , chemistry , mineralogy , metallurgy , polymer , physics , mathematics , organic chemistry , chromatography , combinatorics , composite material
As part of the complete thermodynamic modeling of the Na 2 O–FeO–Fe 2 O 3 –Al 2 O 3 system, the Na 2 O–FeO–Fe 2 O 3 –Al 2 O 3 phase diagrams in air (1583 and 1698 K) and at Fe saturation (1573 and 1673 K) were investigated using the quenching method followed by Electron Probe Micro‐Analyzer ( EPMA ) and X‐ray Diffraction ( XRD ) phase analysis. General features of the phase diagrams in this system were well revealed for the first time. A complete meta‐oxide solid solution between NaAlO 2 and NaFeO 2 was observed. An extensive solid solution of Na 2 (Al,Fe) 12 O 19 Na‐βˮ‐alumina was found and the existence of a miscibility gap in this solution was confirmed. Several compatibility triangles of three‐phase assemblages were also identified in air and at Fe saturation.