Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1486433 | Journal of Non-Crystalline Solids | 2005 | 6 Pages |
Abstract
We analyze ion dynamics in the oxygen ion conductor Gd2Ti2âyZryO7 by impedance spectroscopy measurements. We find that electrical conductivity relaxation is well described by stretched exponentials of the form Φ(t) = exp(â(t/Ï)1ân), with the fractional exponent n increasing systematically with Zr content. Increasing Zr content also leads to an increase in the activation energies for long-range ion diffusion from 0.7 to 1.0 eV. These results are explained in terms of the enhanced cooperativity in oxygen ion dynamics when increasing the concentration of mobile oxygen vacancies with Zr content.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
J. GarcÃa-Barriocanal, K.J. Moreno, G. Mendoza-Suárez, A.F. Fuentes, J. SantamarÃa, C. León,