کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1799015 | 1524827 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of annealing temperature variation on the evolution of structural and magnetic properties of NiFe2O4 nanoparticles synthesized by starch-assisted sol-gel auto-combustion method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Evolution of the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by starch-assisted sol-gel auto-combustion method, and exposed to further annealing at 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C, was evaluated in detail and correlation of these properties explored. The ferrite nanoparticles were characterized by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy, Raman Spectroscopy, Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy and Vibrating Sample Magnetometer. The X-ray diffraction patterns demonstrated single phase formation of NiFe2O4 spinel ferrite nanoparticles at different annealing temperature 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. The change in crystallite size with increase of annealing temperature is observed. The FE-SEM analysis also indicated an increase of particle size with increase of higher annealing temperature. The change in Raman modes and infrared absorption bands were noticed with change of particle size. The X-ray photoelectron spectroscopy revealed the presence of Ni2+ and Fe3+ at octahedral and tetrahedral sites in NiFe2O4 nanoparticles. The representative sample NiFe2O4 nanoparticles annealed at 400 °C, have mixed cation distribution (Ni0.23+2Fe0.52+3)[ Ni0.77+2Fe1.48+3]O4. The highest value of coercivity 62.35 Oe and saturation magnetization 34.10 erg/g were obtained at annealing temperature 600 °C and 1000 °C, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 394, 15 November 2015, Pages 439-447
Journal: Journal of Magnetism and Magnetic Materials - Volume 394, 15 November 2015, Pages 439-447
نویسندگان
Raghvendra Singh Yadav, Jaromir Havlica, Jiri Masilko, Lukas Kalina, Jaromir Wasserbauer, Miroslava Hajdúchová, VojtÄch Enev, Ivo KuÅitka, Zuzana Kožáková,