کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7887194 | 1509789 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of CoFe2O4/PVA-SiO2 nanocomposites: Effect of diol chain length on the structure and magnetic properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The paper presents the influence of diol (1,2-ethanediol, 1,2-propanediol, 1,3-propanediol and 1,4-butanediol) on the formation of magnetic crystalline cobalt ferrite embedded in polyvinyl alcohol-silica hybrid matrix at 200â¯Â°C. Formation of crystalline oxides (CoFe2O4, Co3O4 and Co2SiO4) was studied by X-ray diffraction and Fourier transformed infrared spectroscopy. The effect of annealing temperature and diol chain length on the cobalt ferrite nanocrystallites size was investigated. Using transmission electron microscopy, the size and shape of particles obtained at 200â¯Â°C were recorded and compared to those obtained by annealing at 500, 800 and 1100â¯Â°C. The saturation magnetization (Ms) and coercive field were calculated from the magnetic hysteresis loops of nanocomposites. The Ms was influenced by the particle size and crystallinity only for nanocomposites annealed at 800 and 1100â¯Â°C, when the magnetic domains started to form and to be larger than the critical particle size. The diols used in the synthesis influence both the oxidic phase formation and its properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 9, 15 June 2018, Pages 10478-10485
Journal: Ceramics International - Volume 44, Issue 9, 15 June 2018, Pages 10478-10485
نویسندگان
Thomas Dippong, Oana Cadar, Erika Andrea Levei, Iosif-Grigore Deac, Gheorghe Borodi,