Room-temperature synthesis and conductivity of the pyrochlore type Dy 2(Ti1-yZry)2O 7 (0≤y≤1) solid solution

Karla J. Moreno, Manuel A. Guevara-Liceaga, Antonio F. Fuentes, Javier García-Barriocanal, Carlos León, Jacobo Santamaría

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Abstract

Different compositions in a solid solution of general formula Dy 2(Ti1-yZry)2O 7, showing high oxygen ion conductivity, have been successfully prepared at room temperature via mechanochemical synthesis. Stoichiometric mixtures of the constituent oxides were dry milled together in a planetary ball mill by using zirconia vials and balls. Chemical changes in the powder mixtures as a function of composition and milling time were followed by X-ray diffraction and revealed that, in all cases and after milling for 19 h, the powder mixtures consisted of a single phase. Electrical properties were measured on sintered pellets as a function of frequency, temperature and zirconium content, revealing an increase in conductivity of more than one order of magnitude for y≥0.4, which, as observed in the similar Y2(Ti1- yZry)2O7, has been related with the onset of disordering of the anion sublattice. Despite increasing structural disorder with increasing Zr content, conductivity remains almost constant for y>0.6, reaching a maximum value of ∼5×10-3 for Dy 2Zr2O7 at 900 °C.

Original languageEnglish (US)
Pages (from-to)928-934
Number of pages7
JournalJournal of Solid State Chemistry
Volume179
Issue number3
DOIs
StatePublished - Mar 1 2006

Keywords

  • Dysprosium titanate-zirconate
  • Ionic conduction
  • Mechanochemical synthesis
  • Phase transition
  • Pyrochlores

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