کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298943 1498406 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-temperature proton conductivity in acceptor-doped LaNbO4
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
High-temperature proton conductivity in acceptor-doped LaNbO4
چکیده انگلیسی

The conductivity of acceptor-doped LaNbO4 has been investigated in the temperature range 300 to 1200 °C as a function of the oxygen pressure and water vapor pressure by means of impedance spectroscopy and EMF measurements. The conductivity is predominantly ionic below 800 °C in air and for higher temperatures under reducing conditions. Protons are the major ionic charge carrier in the presence of water vapor. A maximum in proton conductivity of ∼ 0.001 S/cm was obtained at 950 °C in atmospheres containing ca 2% H2O. At high temperatures (> 1000 °C) under oxidizing conditions, electron hole conduction prevails. The conductivity has been modeled assuming that oxygen vacancies and protons compensate the acceptor doping. Transport coefficients describing mobility of defects and thermodynamic constants for the incorporation of protons have been derived.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 177, Issues 13–14, May 2006, Pages 1129–1135
نویسندگان
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