کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8161401 | 1525117 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxide ion diffusion mechanism related to Co and Fe ions in (Ba0.5Sr0.5)(Co0.8Fe0.2)O3âδ using in-situ X-ray absorption spectroscopy
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The time changes of the white line and pre-edge intensities of Co and Fe K-edge in (Ba0.5Sr0.5)(Co0.8Fe0.2)O3âδ (BSCF) were observed to estimate the oxide ion diffusion related to Co and Fe ions by using inâsitu X-ray absorption spectroscopy (XAS) during oxidation. The 20 μm self-standing BSCF film was prepared for inâsitu XAS measurements. The time changes of absorption were fitted to the exponential decay function with two terms. The longer relaxation time (Ï), related to the oxide ion diffusion during the oxidation of BSCF, is dependent on temperature. The oxide ion diffusion coefficients (D) were calculated from the Ï s estimated by inâsitu XAS. The values of the activation energy (Ea) for D related to Co K-edge white line, Co pre-edge, and Fe pre-edge were 1.8-2.0 eV. The value of Ea for D related to Fe K-edge white line, however, was higher than other absorption values at approximately 2.3 eV. We discussed the oxide ion diffusion mechanism related to Co and Fe ions in BSCF using inâsitu XAS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 532, 1 March 2018, Pages 54-58
Journal: Physica B: Condensed Matter - Volume 532, 1 March 2018, Pages 54-58
نویسندگان
Takanori Itoh, Hideto Imai,