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Oxide-ion conduction and dielectric relaxations in Ca-stabilized ZrO 2

The dielectric properties of Ca-stabilized ZrO 2 (Zr 0.9 Ca 0.1 O 2-δ , 10CSZ) which is an oxide ion conductor were investigated. Numerical analyses for the frequency dependence of dielectric constant ( ε r ′) and dielectric loss factors ( ε r ″) revealed that the dielectric properties were made up of Debye-type polarization due to dopant-vacancy associates [Ca zr ″-V o ¨] and interfacial polarization at electrolyte-electrode. Two Debye-type relaxations were observed. This result implies the existence of two dopant-vacancy associates with different distances. Moreover, by using the dielectric constants obtained from the numerical analysis, the frequency dependences of ac conductivity (σ ac ) and dielectric loss tangent (tanδ) were also explained.