Section I: Basic and applied research

Journal of Phase Equilibria

, Volume 16, Issue 4, pp 315-319

First online:

The cubic-tetragonal phase equilibria in the ZrO2-R2O3 (R = Y, Gd, Sm, Nd) systems

  • J. KatamuraAffiliated withDepartment of Materials Science, Faculty of Engineering, The University of Tokyo
  • , T. SekiAffiliated withDepartment of Materials Science, Faculty of Engineering, The University of Tokyo
  • , T. SakumaAffiliated withDepartment of Materials Science, Faculty of Engineering, The University of Tokyo

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Abstract

The cubic-tetragonal (c-t) phase equilibria in the ZrO2-R2O3 (R = Nd, Sm, Gd, Y) systems are examined both experimentally and theoretically. The width of the c-t two-phase field is not simply described as a function of oxygen vacancies as proposed by Hillert and Sakuma (Ref 6) but is dependent on ionic radius of trivalent cations. The larger the ionic radius, the wider the two-phase field. The result is satisfactorily explained by the addition of the excess energy term caused by strain energy in cubic solid solutions to the original model.