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Experimental frequency-dependent conductivity relaxation spectra of a number of molten, glassy, and crystalline ionic conductors that show both the presence of the near constant loss (NCL) and the cooperative ion hopping contribution are analyze[...]texto impreso
León Yebra, Carlos ; Ngai, K. L. ; Rivera Calzada, Alberto Carlos | American Physical Society | 2004-04-16For ionic conductivity relaxation in ionically conducting materials we predict in the framework of the coupling model that the magnitude of the ubiquitous near constant loss correlates with the activation energy E_(a) for independent ion hopping[...]texto impreso
Rivera Calzada, Alberto Carlos ; León Yebra, Carlos ; Sanz, J. ; Santamaría Sánchez-Barriga, Jacobo ; Moynihan, C. T. ; Ngai, K. L. | American Physical Society | 2002-06-10Electrical conductivity measurements of the fast ionic conductor Li_(0.18)La_(0.61)TiO_(3) have been conducted at temperatures ranging from 8 to 300 K and frequencies between 20 Hz and 5 MHz. A detailed analysis of the ac conductivity shows the [...]texto impreso
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Ngai, K. L. ; Lunkenheimer, P. ; León Yebra, Carlos ; Schneider, U. ; Brand, R. ; Lodl, A. | American Institute of Physics | 2001-07-15Previous dielectric relaxation measurements of glycerol and propylene carbonate and new results on propylene glycol performed below the conventional glass transition temperatures T_(g) after long periods of aging all show that the excess wing (a[...]texto impreso
Electrical relaxation data of crystalline yttria-stabilized zirconia are used to analyze the permittivity change observed in the spectra of the real part of the permittivity in ionic conducting materials. It is found that this permittivity chang[...]
