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Solid Solution and Chromium Oxide Loss in Part of the System MgO‐Al 2 O 3 ‐Cr 2 O 3 ‐SiO 2
Author(s) -
WARSHAW I.,
KEITH M. L.
Publication year - 1954
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.1151-2916.1954.tb14016.x
Subject(s) - chromium , solid solution , oxide , materials science , mineralogy , analytical chemistry (journal) , chemistry , metallurgy , chromatography
Thermal and X‐ray studies show that there is complete solid solution between MgO.Cr 2 O 3 and MgO.Al 2 O 3 and that the spinel solid solutions are stable with no exsolution down to temperatures as low as 510°C. There is no solid solution of excess Cr 2 O 3 in MgO.Cr 2 O 3 nor of MgO.Cr 2 O 3 in Cr 2 O 3 . The join MgO.Cr 2 O 3 –Al 2 O 3 is found to be nonbinary; compositions along that join yield mixtures of a chromium oxide‐alumina solid solution and a spinel solid solution on firing to temperatures high enough to promote solid‐state reaction. Chromium oxide loss by volatilization increases at higher temperature. At a given temperature, chromium oxide loss is found to vary directly with the partial pressure of oxygen in the furnace atmosphere and with the ratio of MgO to SiO 2 in the charges heated.