Mixed oxides of the type MO 2(fluorite)-M 2O 3. V. Phase studies in the systems ZrO 2M 2O 3 (M = Sc, Yb, Er, Dy)
Results of phase studies on the systems ZrO 2M 2O 3 (M = Sc, Yb, Er, Dy) are reported. Room-temperature X-ray diffraction of quenched and annealed samples is the main technique used, and the difficulties inherent in this approach to the determination of phase equilibria are discussed. Many of the data so obtained probably relate to metastable states, the nature of which is discussed in the light of structural information on ordered intermediate phases in the ZrO 2Sc 2O 3 and ZrO 2Yb 2O 3 systems. Some speculations on the question of the stability and structure of grossly nonstoichiometric phases observed in various composition regions of these systems are made. A. The System CeO 2Y 2O 3.B. The Systems CeO 2M 2O 3 (M = La,Nd,Sm,Gd,Dy,Ho,Yb) ( 2). Part III. Crystal Structures of the Intermediate Phases Zr 5Sc 2O 13 and Zr 3Sc 4O 12 ( 3). Part IV. J. Solid State Chem., preceding paper.