Solid state reactions involving oxides of trivalent cations
- 1 July 1961
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 65A (4) , 345-374
- https://doi.org/10.6028/jres.065a.037
Abstract
Selected mixtures in 69 binary systems involving Al2O3, Ga2O3, Cr2O3, Fe2O3, Sc2O3, In2O3, Y2O3, and the rare earth oxides were studied by X-ray diffraction techniques after heat treatment at various temperatures. A plot of the radii of the A+3 cations versus the radii of B+3 cations shows the regions of stability for the different structure types found for the double oxides of the trivalent cations. The following structure types were encountered: A, B, and C-type rare earth oxide; corundum, beta gallia; kappa alumina; garnet; perovskite; and several types which could not be definitely related to known structures. The majority of A+3B+3O3 compounds have the perovskite structure. Several phases, including (1-x)Fe2O3·xAl2O3 ss and (1-x)Fe2O3·Ga2O3 ss, appear to have structures similar to kappa alumina. Solid solution definitely occurs in many of the garnet type compounds which contain gallia. Based on the data collected in this survey, the subsolidus phase equilibria relationships of 79 binary systems were drawn.Keywords
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