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Enthalpy of formation of cubic yttria-stabilized hafnia

  • Theresa A. Lee (a1) and Alexandra Navrotsky (a1)
Abstract

The enthalpy of formation of cubic yttria-stabilized hafnia from monoclinic hafnia and C-type yttria was measured by oxide melt solution calorimetry. The enthalpies of formation fit a function independent of temperature and quadratic in composition. The enthalpies of transition from m-HfO2 and C-type YO1.5, to the cubic fluorite phase are 32.5 ± 1.7 kJ/mol and 38.0 ± 13.4 kJ/mol, respectively. The interaction parameter in the fluorite phase is strongly negative, -155.2 ± 10.2 kJ/mol, suggesting even stronger short range order than in ZrO2–YO1.5. Regular solution theory or any other model assuming random mixing on the cation and /or anion sublattice is not physically reasonable. A more complex solution model should be developed to be consistent with the new calorimetric data and observed phase relations.

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b)Address all correspondence to this author.e-mail: anavrotsky@ucdavis.edu
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1J. Wang , H.P. Li and R. Stevens : Hafnia and hafnia-toughened ceramics. J. Mater. Sci. 27, 5397 (1992).

3K.E. Sickafus , J.A. Valdez , J.R. Williams , R.W. Grimes and H.T. Hawkins : Radiation induced amorphization resistance in A2O3–BO2 oxides. Nucl. Instrum. Meth. B 191, 549 (2002).

5A.S. Nowick and D.S. Park in Superionic Conductors , edited by G.D Mahan and W.L. Roth (Plenum Press, New York, 1976)

6V.V. Kharton , A.A. Yaremchenko , E.N. Naumovich and F.M.B. Marques : Research on the electrochemistry of oxygen ion conductors in the former Soviet Union III. HfO2−, CeO2− and ThO2−based oxides. J. Solid State Electrochem. 4, 243 (2000).

7M.F. Trubelja and V.S. Stubican : Ionic conductivity of the fluorite-type hafnia-R2O3 solid solutions. J. Am. Ceram. Soc. 74, 2489 (1991).

8J.D. Schieltz , J.W. Patterson and D.R. Wilder : Electrolytic behavior of yttria-stabilized hafnia. J. Electrochem. Soc. 118, 1257 (1971).

9T.H. Etsell and S.N. Flengas : Electrical properties of solid oxide electrolytes. Chem. Rev. 70, 339 (1970).

11A. Navrotsky : Progress and New Directions in High Temperature Calorimetry Revisited. Phys. Chem. Miner. 24, 222 (1997).

13J.M. McHale , G.R. Kowach , A. Navrotsky and F.J. DiSalvo : Thermochemistry of Metal Nitrides in the Ca/Zn/N System. Chem. Eur. J. 2, 1514 (1996).

14D.W. Stacy and D.R. Wilder : J. Am. Ceram. Soc. 58, 285 (1975).

18J.E. Lowther , J.K. Dewhurst , J.M. Leger and J. Haines : Relative stability of ZrO2 and HfO2 structural phases. Phys. Rev. B 60, 14485 (1999).

19A.S. Foster , F. Lopez Gejo , A.L. Shluger and R.M. Nieminen : Mechanism of interstitial oxygen diffusion in hafnia. Phys. Rev. B 65, 174117 (2002).

22C.R. Stanek and R.W. Grimes : Prediction of rare earth A2Hf2O7 pyrochlore phases. J. Am. Ceram. Soc. 85, 2139 (2002).

24M. Duclot , I. Vicat and C.H. Deportes : Mise en evidence et etude de la phase ordonnée Y2Hf7O17 dans le système HfO2–Y2O3. J. Solid Sate Chem. 2, 236 (1970).

26J.P. Goff , W. Hays , S. Hull , M.T. Hutchings and K.N. Clauseen : Defect structure of yttria-stabilized zirconia and its influence on the ionic conductivity at elevated temperatures. Phys. Rev. B 59, 14202 (1999).

27D. Steele and B.E.F. Fender : The structure of cubic ZrO2:YO1.5 solid solutions by neutron scattering. J. Phys. C: Solid State Phys. 7, 1 (1974).

28I.R. Gibson and J.T.S. Irvine : Study of Order/Disorder Transition in Yttria-stabilised Zironia by Neutron Diffraction. J. Mater. Chem. 6, 895 (1996).

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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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