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Cooperative oxygen ion dynamics in Gd_(2)Ti_(2-y)Zr_(y)O_(7)

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Moreno, K. J. and Mendoza-Suárez, G. and Fuentes, A. F. and Garcia Barriocanal, Javier and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo (2005) Cooperative oxygen ion dynamics in Gd_(2)Ti_(2-y)Zr_(y)O_(7). Physical review B, 71 (13). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.71.132301


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Abstract

We report on dispersive conductivity measurements in the oxygen ion conductor Gd_(2)(Ti_(2−y)Zr_(y))O_(7). 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.


Item Type:Article
Additional Information:

© 2005 The American Physical Society. Authors from CINVESTAV-IPN thank CONACYT for fi- nancial support. Authors from Universidad Complutense acknowledge financial support from MCYT. K.J.M. thanks CINVESTAV-IPN for financial support during her stay at Universidad Complutense.

Uncontrolled Keywords:Electrical response; Germanate glasses; Local-structure; Relaxation; Conductivity; Conductors; Pyrochlore; Diffusion; Disorder; Fluorite.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:30632
Deposited On:03 Jun 2015 10:26
Last Modified:10 Dec 2018 14:58

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