کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1458788 989581 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stability and electrical conductivity of BaCe0.85Tb0.05M0.1O3−δ (M=Co, Fe, Y, Zr, Mn) high temperature proton conductors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Stability and electrical conductivity of BaCe0.85Tb0.05M0.1O3−δ (M=Co, Fe, Y, Zr, Mn) high temperature proton conductors
چکیده انگلیسی

High temperature proton conductors (HTPCs) must possess both high electrical conductivity and good chemical and structural stability for practical applications. In this work, BaCe0.85Tb0.05M0.1O3−δ (BCTM) high temperature proton conductors doped with M=Co, Fe, Y, Zr, Mn were prepared by the sol-gel combustion method using EDTA and citric acid as the chelating agents. The structural and chemical stability, and electrical conductivity of the BCTM perovskites were measured in different atmospheres by the powder X-ray diffraction (XRD) and four-probe techniques. The results indicate that the perovskite phase formed in the BCTM oxides after calcination at 1000 °C can be preserved well in H2 and water vapor-containing atmospheres, whereas the perovskites may be segregated into metal oxides and react with CO2 into carbonates in the CO2 environment due to the strong alkalinity of the BaCeO3 composites. The electrical conductivity of the BCTM oxides in hydrogen atmosphere is noticeably higher than in the air atmosphere, confirming the dominant protonic conductivity in the BCTM perovskites. Doping with Mn or Co ions in the BCTb perovskite favors improving the electrical conductivity with lower activation energy. The BCTMn perovskite demonstrates an N-shaped variation trend in electrical conductivity with temperature due to the multi-valence states for Mn ions presented at different temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 42, Issue 11, 15 August 2016, Pages 13278–13284
نویسندگان
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