کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1491881 992362 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ
چکیده انگلیسی

Electrical conduction properties of complex perovskite-type oxides in the (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ (y = 0.02–0.06) series at intermediate-high temperatures were investigated; introduction of protons by hydration of oxide-ion vacancies was expected by increasing the Mg/Nb ratio from unity. The conductivity depended on y and a maximum conductivity was obtained at y = 0.04: σ = 4.9 × 10−6 S cm−1 at 400 °C in wet H2 atmospheres. From electromotive force measurements of hydrogen and water vapor concentration cells, electrical conduction in wet H2 atmospheres can be attributed to ionic conduction, and proton conduction is dominant below 700 °C. Unlike other perovskite-type proton conductors, (La0.5Sr0.5)(Mg0.54Nb0.46)O3−δ was stable in CO2 atmospheres even in the low-intermediate temperature region due to dilution of reactive strontium by lanthanum.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 44, Issue 2, 4 February 2009, Pages 457–461
نویسندگان
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