کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298928 1498395 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical and thermal properties of (Ba0.5Sr0.5) 1−xSmxCo0.8Fe0.2O3−δ perovskite oxides
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrical and thermal properties of (Ba0.5Sr0.5) 1−xSmxCo0.8Fe0.2O3−δ perovskite oxides
چکیده انگلیسی

(Ba0.5Sr0.5) 1−xSmxCo0.8Fe0.2O3−δ (BSSCF; 0.05≤ x ≤0.20) compounds were synthesized and characterized by powder X-ray diffraction (XRD), thermogravimetric (TG), electrical conductivity, and thermal expansion coefficient (TEC) measurements. An emphasis is made on the effect of Sm-doping on the material's properties. XRD measurements showed that the BSSCF sample had a cubic perovskite structure, while TG measurements proved the loss of lattice oxygen during heating up. The electrical conductivity increased with temperature up to about 350–450 °C, and then decreased due to the loss of lattice oxygen. Additionally, the lattice oxygen loss caused the differences in electrical conductivity on heating up and cooling down. Electrical conductivity relaxation measurements were performed on the x = 0.10, 0.20 samples at 450, 470, and 500 °C, and showed that the diffusion coefficient decreased with increasing content of Sm. The TEC values of BSSCF were 19.5–20.1 × 10− 6 K− 1 from 30 to 800 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 5–6, March 2007, Pages 417–422
نویسندگان
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