Cooperative oxygen ion dynamics in Gd2Ti2-yZryO7

K. J. Moreno, G. Mendoza-Suárez, A. F. Fuentes, J. García-Barriocanal, C. León, J. Santamaria

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We report on dispersive conductivity measurements in the oxygen ion conductor Gd2 (Ti2-y Zry) O7. Increasing Zr content leads to higher concentration of oxygen vacancies and results in higher activation energies for long-range ion transport, whilst the microscopic energy barrier for single ion hopping remains constant. We find evidence that, besides oxygen binding energy, enhanced cooperativity in oxygen ion dynamics determines the activation energy for long-range diffusion.

Original languageEnglish (US)
Article number132301
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - 2005


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