کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331324 979002 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proton conductivity of potassium doped barium zirconates
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Proton conductivity of potassium doped barium zirconates
چکیده انگلیسی

Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10%. Introducing extra potassium leads to the formation of second phase or YSZ impurities. The water uptake of barium zirconates was increased even with 5% doping of potassium at the A-site. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. The maximum solubility for yttrium at B-sites is around 15 at% after introducing 1 wt% zinc. The conductivity of Ba0.95K0.05Zr0.85Y0.11Zn0.04O3−δ at 600 °C is 2.2×10−3 S/cm in wet 5% H2. The activation energies for bulk and grain boundary are 0.29(2), 0.79(2) eV in wet 5% H2 and 0.31(1), 0.74(3) eV in dry 5% H2. A power density of 7.7 mW/cm2 at 718 °C was observed when a 1 mm thick Ba0.95K0.05Zr0.85Y0.11Zn0.04O3−δ pellet was used as electrolyte and platinum electrodes.

Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10 %. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. Five percent doping of potassium at A-site can double the total conductivity.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 183, Issue 1, January 2010, Pages 93–98
نویسندگان
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