Abstract
Different compositions in a solid solution of general formula Dy 2(Ti 1− y Zr y ) 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 Y 2(Ti 1− y Zr y ) 2O 7, 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 2Zr 2O 7 at 900 °C.
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