کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6617796 459633 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and electrical conductivity of BaCe0.85Ln0.15O3−δ (Ln = Gd, Y, Yb) ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Structure and electrical conductivity of BaCe0.85Ln0.15O3−δ (Ln = Gd, Y, Yb) ceramics
چکیده انگلیسی
BaCe0.85Ln0.15O3−δ (Ln = Gd, Y, Yb) ceramics are synthesized by the solid state reaction method. All of BaCe0.85Ln0.15O3−δ ceramics are composed of a single perovskite-type phase. The grain size of BaCe0.85Ln0.15O3−δ (Ln = Gd, Y, Yb) ceramics decreases with decreasing the ionic radius of doped cations. BaCe0.85Y0.15O3−δ ceramic has the highest total conductivity at 1073 K in both 4% H2O-saturated H2 and air among three kinds of BaCe0.85Ln0.15O3−δ ceramics. Total conductivities of BaCe0.85Gd0.15O3−δ and BaCe0.85Y0.15O3−δ ceramics exceed 0.01 S cm−1 in both 4% H2O-saturated H2 and air above 773 K. The pre-exponential factors and activation energies of BaCe0.85Ln0.15O3−δ ceramics are similar both in 4% H2O-saturated H2 and in air. The crystal structure, relative density and grain boundary area are the main influencing factors on electrical conductivity of doped barium cerates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 105, 30 August 2013, Pages 547-553
نویسندگان
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