کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8155941 1524840 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, structural and magnetic properties of ZnxMg1−xFe2O4 nanoferrites
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Synthesis, structural and magnetic properties of ZnxMg1−xFe2O4 nanoferrites
چکیده انگلیسی
ZnxMg1−xFe2O4 nanoparticles (0≤x≤1 in steps of 0.1) have been produced by centrifugation using the low temperature glycol-thermal method at 200 °C. Single-phase formation was confirmed by X-ray powder diffraction which revealed a well-defined cubic spinel structure with space group Fd3m. HRTEM and TEM were also used for the morphology studies. The crystallite size of the compounds ranged from 10.6 to 22.2 nm. A strong correlation was found between X-ray density and Zn-concentration, x. The magnetic properties as a function x were investigated by using 57Fe Mössbauer spectroscopy, magnetization measurements using a Lakeshore vibrating sample magnetometer (VSM) at room temperature. We also report VSM measurement on a cryogen free measurement system at isothermal temperatures between 4 K and 300 K in external applied magnetic fields of up to 5 T. For x<0.8, the room-temperature Mössbauer results show that the samples were transformed from paramagnetic state to magnetic ordered state. The temperature-dependences of saturation magnetization and coercive field follow the modified Bloch's law and Kneller's law, respectively. Strong correlation between saturation magnetization MS(0) and crystallite size D is observed. Two distinct composition ranges with Zn content are identified for which MS(0) variation with x is explained by the Néel and Yafet-Kittel models.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 381, 1 May 2015, Pages 41-49
نویسندگان
, , ,