A liquidus surface for the Al2O3-rich corner of the Al2O3 - ZrO2 - Gd2O3 system is constructed. Ternary peritectic and eutectic points are discovered. No ternary compounds were found in the system studied. The ternary eutectic Al2O3 + GdAlO3 + F - ZrO2 exhibits the cooperative phase growing mechanism which allows one to obtain composite materials by the method of eutectic directional solidification.A liquidus surface for the Al2O3-rich corner of the Al2O3 - HfO2 - Gd2O3 system is constructed. No ternary compounds were found in the system under study. The ternary transformation point and the ternary eutectic point are discovered. The ternary eutectic Al2O3 - GdAlO3 - F-HfO2 exhibits the cooperative phase growing mechanism which allows one to obtain composite materials by the method of eutectic directional solidification.

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