Abstract
The cubic‐tetragonal (c‐t) phase equilibria in the system ZrO2‐YO1.5 are thermodynamically analyzed from Landau's phenomenological theory. The calculated c‐t two‐phase field is depicted as a miscibility gap with a sharp maximum and the spinodal region as originally predicted by Hillert and Sakuma. However, the observed c‐t two‐phase field and the spinodal region are better described by the present model. In addition, this model can be used to discuss the nature of the c‐t diffusionless transformation from the order parameter in contrast with the original model. The predicted change in the tetragonality of t‐ZrO2 with YO1.5 content is slightly different from that in the c/a axial ratio estimated from X‐ray diffraction analysis. The displacement of cations and anions may not take place simultaneously during the c‐t transformation.
Published Version
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