کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298763 1498371 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxygen stoichiometry and transport properties of cerium niobate
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Oxygen stoichiometry and transport properties of cerium niobate
چکیده انگلیسی

CeNbO4 + δ has been synthesized by both solid state and wet chemical routes and characterized with respect to electrical conductivity and oxygen stoichiometry between 900 °C and 1100 °C and pO2 from 1 bar to 0.002 bar. CeNbO4 + δ was shown to exhibit mixed conductivity with oxygen interstitials and electron holes being the major charge carriers. The activation energies for chemical diffusion (Dchem) and surface exchange coefficient (kchem), determined by electrical relaxation measurements, were 55.8 ± 3.7 and 198 ± 20 kJ/mol, respectively. Finally, both Dchem and kchem were reduced with decreasing partial pressure of oxygen.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 179, Issues 21–26, 15 September 2008, Pages 1061–1065
نویسندگان
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