Cooperative oxygen ion dynamics in Gd_(2)Ti_(2-y)Zr_(y)O_(7)
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2005
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American Physical Society
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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.
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© 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.