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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
Papers

Abstract

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.

Keywords

Polymer Phase Diagram Solid Solution Fluorite Phase Equilibrium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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