Ce_<1-x>Sm_xO_<2-δ>系における誘電緩和

概要

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Dielectric relaxations were investigated for the solid-solution system Ce_<1-x>Sm_xo_<2-δ>(0.0≦x≦0.5), which is a typical oxide-ion conductor. The dielectric constants showed anomalously large values at low frequencies and high temperatures. Computer simulation clarified that the anomalously large dielectric constant (ε_r') originated from the superimposition of both Debye-type polarization and interfacial polarization between electrolyte and electrode. Two kinds of Debye-type relaxation observed were ascribed to defect associates, (Sm_<Ce>'-V_o)^. and (Sm_<Ce>'-V_o-Sm_<Ce>')^×. The Debye-type polarization was also confirmed by analyzing the dielectric loss factor (ε_r"). When the oxide-ion conductivity decreased in the heavy Sm-doped samples, the Debye-type polarization also disappeared, suggesting that ordering of oxygen vacancy suppressed the electric field response of Debye-type polarization.
社団法人日本セラミックス協会の論文
2007-04-01