کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298883 1498394 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Local environment of Barium, Cerium and Yttrium in BaCe1 − xYxO3 − δ ceramic protonic conductors
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Local environment of Barium, Cerium and Yttrium in BaCe1 − xYxO3 − δ ceramic protonic conductors
چکیده انگلیسی

Y-doped barium cerate protonic conductors with composition BaCe1 − xYxO3 − δ (x = 0.02, 0.1, 0.2, 0.3) have been synthesized by sol–gel route, giving by X-ray diffraction tests a homogeneous crystalline phase. A commercial sample BaCe0.8Y0.2O3 − δ produced by combustion spray pyrolysis was also provided for comparison aim. The local structure around the cations was studied by X-ray absorption spectroscopy at the K-edges of Ba, Ce and Y. It is demonstrated that the insertion of yttrium in the site of cerium produces a remarkable local distortion of the dopant first-shell octahedral environment that affects also the next coordination shells by a static disorder increasing with dopant amount. For a dopant concentration estimated as x > 0.17, a poorly crystallized yttrium oxide phase that cannot be detected by X-ray diffraction is segregated. The static disorder around Y noticeably increases in the protonated samples and can be related to a preferential location of protons near the dopant.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 7–10, April 2007, Pages 587–591
نویسندگان
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