Phase Relations and Ordering in the Systems MgO-Y2O3-ZrO2 and CaO-MgO-ZrO2 |
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| Authors: | JOHN R HELLMANN&#; VLADIMIR S STUBICAN&#; |
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| Affiliation: | Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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| Abstract: | The phase relations in the systems MgO-Y2O3-ZrO2 and CaO-MgO-ZrO2 were established at 1220° and 1420°C. The system MgO-Y2O3-ZrO2 possesses a much-larger cubic ZrO2 solid solution phase field than the system CaO-MgO-ZrO2 at both temperatures. The ordered δ phase (Zr3Y4O12) was found to be stable in the system ZrO2-Y2O3 at 1220°C. Two ordered phases φ1 (CaZr4O9) and φ2 (Ca6Zr19O44) were stable at 1220°C in the system ZrO2-CaO. At 1420°C no ordered phase appears in either system, in agreement with the previously determined temperature limits of the stability for the δ, φ1, and φ2 phases. The existence of the compound Mg3YzO6 could not be confirmed. |
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