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Phase Relations in the System Al 2 O 3 ─Ce 2 Si 2 O 7 in the Temperature Range 900° to 1925°C in Inert Atmosphere
Author(s) -
Tas A. Cuneyt,
Akinc Mufit
Publication year - 1993
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.1151-2916.1993.tb03945.x
Subject(s) - liquidus , eutectic system , cerium , atmospheric temperature range , melting point , analytical chemistry (journal) , anorthite , phase (matter) , materials science , congruent melting , phase diagram , mineralogy , crystallography , chemistry , thermodynamics , metallurgy , microstructure , physics , organic chemistry , chromatography , composite material
Equilibrium relationships in the system Al 2 O 3 ‐Ce 2 Si 2 O 7 in inert atmosphere have been investigated in the temperature range 900° to 1925°C. A simple eutectic reaction was found at 1375°C and 51 mol% Ce 2 Si 2 O 7 . A high‐low polymorphic transformation in Ce 2 Si 2 O 7 was observed at 1274°C. New XRD patterns are suggested for both polymorphs of cerium pyrosilicate. The melting point of Ce 2 Si 2 O 7 was found to be 1788°C. A value for ΔH° m,Ce2Si2O7 of 36.81 kJ/mol was calculated from the initial slope of the experimentally determined liquidus in equilibrium with the pyrosilicate phase.