Abstract
In the temperature range 1600 to 1900° C, the system A2O3-Cr2O3-ZrO2 is characterized by the coexistence of ZrO2 (unstablilized) and an (Al, Cr)2O3 solid solution series. In the systems MgO-Cr2O3-ZrO2 and MgO-Al2O3-ZrO2 a nearly stoichiometric spinel coexists with both stabilized and unstabilized ZrO2. At temperatures above 1600°C a new ternary Mg-Al-Zr oxide becomes stable in the MgO-rich part of the MgO-Al2O3-ZrO2 system.
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