Papers by Keyword: Universal Dielectric Response

Abstract: The relationship between the optical phonon parameters and the oxygen ion conductivities were investigated for AlYb co-doped zirconia ceramics. Intrinsic intragrain ion conductivity, σ_dc, decreased with increasing Al loading into ytterbia-stabilized zirconia, while the damping parameter of the lattice vibration, γ_1TO, increased. This phenomenon agreed with findings of our previous study, which revealed a relationship between the σ_dc and the γ_1TO for zirconia-based ion conductors.

Abstract: All contributions to the total conductivity, electrolyteelectrode interfaces, grain boundaries, ion-hopping, and optical phonons, were determined on the 8 mol% yttria-stabilized zirconia (8YSZ) and 8 mol% ytterbia-stabilized zirconia (8YbSZ) ceramics using the wideband conductivity spectroscopy. Complex conductivity spectra from 10¹ Hz to 10¹⁴ Hz were successfully obtained. The higher total conductivity of the 8YbSZ ceramics compared to the 8YSZ in wideband frequencies was mainly attributed to difference in the DC conductivity due to universal dielectric response (UDR), σ_dc; σ_{dc (8YbSZ)} > σ_{dc (8YSZ)}. Other parameters in the UDR and the optical phonon parameters did not greatly influence on the difference in their intrinsic conductivities.