Liquidus Surface of the ZrО₂–Y₂О₃–Еu₂O₃ Phase Diagram

Abstract

The derivative thermal analysis in air u to 3000 C, X-ray diffraction, petrography, and electron microscopy are employed to examine phase equilibria on the liquidus surface of the ZrО₂–Y₂О₃–Еu₂O₃ phase diagram. It is established that the liquidus surface of the system is formed by four primary crystallization fields of the phases: solid solutions based on hexagonal (N) and cubic (C) crystalline modifications of Y₂О₃, cubic ZrО₂ modification with fluorite (F) structure, and high-temperature cubic modification (X) of Еu₂O₃. Two quadriphase invariant incongruent equilibria are established in the ternary system.