Abstract
The mixing parameters of liquid phase in the Al2O3–Y2O3–AlN system were assessed based on differential thermal analysis (DTA) and scanning electron microscopy combined with energy dispersive X-ray spectroscopy (SEM/EDX) investigations of selected compositions. Phase diagram of the Y2O3–AlN system was calculated. Liquidus surface of the Al2O3–Y2O3–AlN system was constructed and compared with experimental results on primary crystallisation fields. Calculated temperatures of invariant reactions were in agreement with DTA results. Vertical sections of the Al2O3–Y2O3–AlN system were calculated and compared with experimental data
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