کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5450404 | 1398501 | 2016 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nucleation and growth kinetics of La0.7Sr0.3Cr0.4Mn0.6O3-δ SOFC perovskite: Symmetry alteration evolution induced by Cu2+ and Ni2+ impregnation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
La0.7Sr0.3Cr0.4Mn0.6O3-δ perovskite nanoparticles have been synthetized using an ethylene glycol modified sol-gel method and impregnated by Cu0.75Ni0.25 nanoparticles. The phase transitions and nucleation kinetics were studied by time resolved x-ray diffraction, Rietveld, Raman spectroscopy and high resolution transmission electron microscopy. Findings have shown that, an atomic disorder dominates from room temperature to 400 °C. Nanoparticles with crystal size <26 nm start through nuclei formation of La0.7Sr0.3Cr0.4Mn0.6O3-δ and SrCrO4 solid solutions with Pm3¯m cubic and P21/n monoclinic symmetry respectively in the range of 600-650 °C. Symmetry reduction from the Pm3¯mâ¶R3¯c space group had been obtained at a lower temperature (750 °C) than those reported in the literature in oxygen atmosphere and it was confirmed by an octahedral distortion, which takes place in the crystallographic direction[22Ì
1]/(12Ì
2). The Johnson-Mehl-Avrami model had described the whole process, where the existence of two phases was shown before it reached its complete D3d6 point group symmetry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Natural Science: Materials International - Volume 26, Issue 6, December 2016, Pages 665-670
Journal: Progress in Natural Science: Materials International - Volume 26, Issue 6, December 2016, Pages 665-670
نویسندگان
A. Concha-Balderrama, G. Rojas-George, J. Alvarado-Flores, H. Esparza-Ponce, M.H. Bocanegra-Bernal, A. Reyes-Rojas,