کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8157341 1524860 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Superparamagnetic behavior of MnxNi1−xFe2O4 spinel nanoferrites
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Superparamagnetic behavior of MnxNi1−xFe2O4 spinel nanoferrites
چکیده انگلیسی
The glycol-thermal technique was used for the synthesis of MnxNi1−xFe2O4 (x=0.1, 0.3 and 0.5) nanoparticle ferrites from high-purity metal chlorides. Structural parameters, morphology and magnetic properties were investigated using X-ray powder diffraction (XRD), high-resolution transmission electron microscopy, high-resolution scanning electron microscopy, energy-dispersive X-ray spectroscopy, 57Fe Mössbauer spectroscopy, vibrating sample magnetometer (VSM) and VSM on a cryogen free measurement system. The XRD results confirm single-phase formation of the as-prepared samples with average crystallite sizes of about 8.5 nm having the Fd3m space group. The microstrains for the as-prepared samples were relieved by increasing the Mn-concentration, x, while the crystallite sizes and lattice parameters increased slightly. The magnetizations for the sample at x=0.5 were also measured in external applied fields of up to 5 T and at isothermal temperatures from 2 K to 300 K. Small values of coercive fields (≤10Oe), remanent magnetizations and broadening of the Mössbauer spectra at room temperature indicate superparamagnetic like-behavior of the nanoparticle compounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 361, June 2014, Pages 170-174
نویسندگان
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