RT Journal Article
T1 Correlated ion hopping in single-crystal yttria-stabilized zirconia
A1 León Yebra, Carlos
A1 Lucía Mulas, María Luisa
A1 Santamaría Sánchez-Barriga, Jacobo
AB 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.
PB American Physical Society
SN 0163-1829
YR 1997
FD 1997-01-01
LK https://hdl.handle.net/20.500.14352/59659
UL https://hdl.handle.net/20.500.14352/59659
LA eng
NO © 1997 The American Physical Society.
DS Docta Complutense
RD 10 abr 2025