کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1296322 1498271 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Moving boundary diffusion problem for hydration kinetics evidenced in non-monotonic conductivity relaxations of proton conducting perovskites
ترجمه فارسی عنوان
مشکل انتقال دیفرانسیل متحرک برای سینتیک هیدراتاسیون نشان می دهد که در رگهای هدایت غیر مونوتنی پرووکویت ها
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• High temperature van der Pauw method on disk samples with peripheral electrodes
• Moving boundary diffusion mechanism for water incorporation in proton conductors
• Composition-dependent kinetics in Y-doped barium zirconate–cerate solid solutions
• Similar T-dependence of chemical diffusivity for hydration and oxygen incorporation
• Hole trapping mechanism for the activation energy of chemical diffusivities

A high temperature van der Pauw method using a bulk disk sample was applied for a more reliable kinetic investigation in a protonic ceramic conductor, barium zirconate doped with 20 m/o yttrium. Similarly activated faster hydrogenation and slower oxygenation process can be explained by the moving boundary diffusion mechanism previously evidenced by in-situ optical spectroscopy where the hydrogenation kinetics is limited by the hydration front. The mechanism generally applies to all protonic ceramic conductors exhibiting non-monotonic conductivity relaxations. Defect-chemical consideration on the humidity, oxygen activity and temperature dependence of chemical diffusivities is provided.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 272, April 2015, Pages 60–73
نویسندگان
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