کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298277 1498391 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric relaxations in the Ce1−xNdxO2−δ system
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Dielectric relaxations in the Ce1−xNdxO2−δ system
چکیده انگلیسی

Dielectric relaxations were investigated for the solid solution system Ce1−xNdxO2−δ (0.0 ≦ x ≦ 0.5) having a fluorite-type structure, which is a typical oxide-ion conductor. The dielectric constants showed anomalously large values at low frequencies and high temperatures. Numerical analysis of frequency dependence of dielectric constant (εr′) clarified that the anomalously large εr′ originated from the superimposition of both Debye-type polarization and interfacial polarization between electrolyte and electrode. Two kinds of Debye-type relaxations observed were ascribed to defect associates, (NdCe′ − VO¨)· and (NdCe′ − VO¨ − NdCe′)x. The Debye-type polarizations were also confirmed by analyzing the dielectric loss factor (εr″). When the oxide-ion conductivity decreased in the heavy Nd-doped samples, both the Debye-type and the interfacial polarizations also decreased, suggesting that ordering of oxygen vacancy suppressed the electric field response of Debye-type polarization, resulting in the decrease of oxide-ion conductivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 15–18, June 2007, Pages 1059–1064
نویسندگان
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