Journal of Materials Science

, Volume 16, Issue 11, pp 3067–3076 | Cite as

Phase equilibria and ordering in the erbia-zirconia system

  • C. Pascual
  • P. Duran


The phase diagram for the system ZrO2-Er2O3 was redetermined. At high temperatures, the system is dominated by wide regions of solid solution based on ZrO2 and Er2O3 separated by a two-phase field which appears to extend to the solidus. The range of existence of these solid solution fields was determined using the precision lattice parameter method. A low-temperature (<1800° C) long-range ordering occurred between 20 and 90 mol % Er2O3, and three ordered phases were found: the first compound was present at 40 mol % Er2O3 and corresponds to the ideal formula Er4Zr3O12 with rhombohedral symmetry (space group R¯3), is isostructural with UY6O12, and decomposes at about 1500° C into fluorite solid solution by an order-disorder process; the second ordered phase is formed at about 55 mol % Er2O3, its formula is close to Er5Zr2O11.5, and it decomposes at about 1650° C into cubic solid solutions of the fluorite and C-type; the third compound is formed at 75 mol % Er2O3, its formula is Er6ZrO11, it has a wide homogeneity range, and it decomposes above 1700° C into a cubic solid solution of the C-type. Liquidus determination indicated the existence of a peritectic at 62 mol % Er2O3.


Polymer Phase Diagram Solid Solution Fluorite Phase Equilibrium 
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Copyright information

© Chapman and Hall Ltd. 1981

Authors and Affiliations

  • C. Pascual
    • 1
  • P. Duran
    • 1
  1. 1.Departamento de Materiales, Cerámicos EspecialesC.S.I.C. Instituto de Cerámica y VidrioMadridSpain

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