Record number :
Title of article :
Dielectric function and localized diffusion in ion conducting glasses
Author/Authors :
Banhatti، نويسنده , , Radha D. and Funke، نويسنده , , K.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2004
Pages :
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Abstract :
We present the three coupled rate equations of the mismatch generated relaxation for the accommodation and transport of ions (MIGRATION) concept that describe the ion dynamics in, for example, ion-conducting glasses and simultaneously yield scaled conductivity and permittivity spectra. Here, model spectra are compared with the experimental spectra of xNa2O·(1-x)GeO2 glasses for x=0.0513, 0.0902, 0.213. This allows us to estimate the long-time limit of the localized rms displacement, lim t → ∞ { < R 2 ( t ) > − 6 ⁢ D ⁢ t } 0.5 , which may be roughly interpreted as the average size of the ion cage before the dynamics become diffusive. For the three compositions considered, we obtain an approximate x−1/3 dependence of this quantity, which implies that the ion dynamics are largely governed by the Coulomb interactions between the mobile ions.
Keywords :
Dielectric function , Localized diffusion , Sodium germanate glasses , MIGRATION concept
Journal title :
Solid State Ionics
Serial Year :
Link To Document :