کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1464713 989669 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-temperature synthesis of La0.6Sr0.4Co0.2Fe0.8O3−δ perovskite powder via asymmetric sol–gel process and catalytic auto-combustion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Low-temperature synthesis of La0.6Sr0.4Co0.2Fe0.8O3−δ perovskite powder via asymmetric sol–gel process and catalytic auto-combustion
چکیده انگلیسی

La0.6Sr0.4Co0.2Fe0.8O3−δ powder was synthesized by a combined EDTA-citrate complexing process via low-temperature auto-combustion synthesis with NH4NO3 as an oxidizer and a combustion trigger. Two novel methods were explored to improve this auto-combustion technology with reduced NH4NO3 addition: the use of La0.6Sr0.4Co0.2Fe0.8O3−δ as the combustion catalyst and the application of asymmetric sol–gel process to provide the precursor with different NH4NO3 concentrations. The prepared perovskite powder was characterized by BET, SEM, XRD and iodometric titration techniques. The catalytic performance of the powder was also examined in the decomposition of peroxide hydrogen. Experimental results indicate that powders from catalytic combustion and asymmetric precursor routes have more advantages in terms of better crystallites, higher specific surface area, higher B-site valence state, improved sintering capability and better catalytic performance in peroxide hydrogen decomposition than that from the synthesis with uniform NH4NO3 distribution.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 35, Issue 7, September 2009, Pages 2809–2815
نویسندگان
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