Abstract
A polynomial method has been used to construct a model for the liquidus surface in the ZrO2-Y2O3-Sm2O3 phase diagram; that surface is made up of four fields of primary crystallization for the following phases: solid solutions based on cubic (C) and hexagonal (H) Y2O3, cubic ZrO2 with a structure of fluorite type F, and high-temperature cubic La2O3 (X). The ternary system has two nonvariant four-phase equilibria of incongruent type.
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