The Systems Zirconia‐Lanthana and Zirconia‐Neodymia

Abstract

The minimum amounts of lanthana and neodymia required to stabilize zirconia into a cubic form are 30 and 20 mole %, respectively, at 980°C. X‐ray diffraction studies have established the upper limit of the two cubic solid solution regions as approximately 40 mole %. This stabilized region of the phase diagrams broadens slightly in each system as the temperature of heat‐treatment is raised. Based on experimental evidence obtained by X‐ray diffraction and dilatometric methods, phase diagrams for the systems zirconia–lanthana and zirconia–neodymia are proposed.