کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
190736 459706 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical properties of samaria-doped ceria electrolytes from highly active powders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrical properties of samaria-doped ceria electrolytes from highly active powders
چکیده انگلیسی

The correlations of the microstructures and the electrical properties of high reactive Ce0.8Sm0.2O1.9 (SDC) powders, synthesized via an optimal carbonate coprecipitation method, were investigated. Microstructure of the SDC ceramics sintered at 900–1400 °C showed uniform grain and small grain size, compared with those prepared with various methods under similar sintering conditions. These features may be related to high conductivity (σ600 °C = 0.022 S cm−1) and low activation energy for conduction (0.66 eV). AC impedance spectra were involved to resolve grain interior and grain boundary resistance. Grain boundary contribution to the total resistance showed the values below 1/2 at 200–450 °C, suggesting low grain boundary effect. The motion enthalpy for the grain interior conduction decreased while the association enthalpy increased with sintering temperature up to 1300 °C, which might be possibly originated from the increase in lattice parameters with the sintering temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 55, Issue 15, 1 June 2010, Pages 4529–4535
نویسندگان
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