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Correlated ion hopping in single-crystal yttria-stabilized zirconia

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León Yebra, Carlos and Lucía Mulas, María Luisa and Santamaría Sánchez-Barriga, Jacobo (1997) Correlated ion hopping in single-crystal yttria-stabilized zirconia. Physical review B, 55 (2). pp. 882-887. ISSN 0163-1829

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Official URL: http://dx.doi.org/10.1103/PhysRevB.55.882


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Abstract

A study of the effect of correlated ion motion on the electrical conductivity relaxation in single-crystalline yttria-stabilized zirconia is presented. Complex admittance in the radio frequency range show power-law dependencies in the real part of the conductivity at high frequencies of the form ω^(n) and asymmetric electric modulus plots as a result of correlations. An analysis of the frequency dependence of the electric modulus is conducted to obtain time decay functions of the form exp[-(t/τ)^(β)] from an analytical distribution of relaxation times. Correlation times, and parameters n and β characterizing the relaxation in time and frequency domains are compared to show the equivalence of time and frequency representations. The common origin of ac and dc processes is discussed in view of the frequency dependence of the complex conductivity. From a macroscopic activation energy for ion motion E = 1.16 eV and a β value of 0.43, a single-ion microscopic activation energy E_(a) = 0.5 eV is obtained as βE according to Ngai’s coupling model. The microscopic activation energy is related to the association energy of oxygen vacancies.


Item Type:Article
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© 1997 The American Physical Society.

Uncontrolled Keywords:AC-conductivity; Relaxation; Glasses; Temperature; Conductors; Dynamics; Behavior; Systems.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:31275
Deposited On:21 Jul 2015 08:36
Last Modified:10 Dec 2018 14:58

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