کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8156760 | 1524847 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic properties of Nanocrystalline Co and Ni synthesized via superhydride reduction route
ترجمه فارسی عنوان
خواص مغناطیسی نانوکریستالیک و نی سنتز شده از طریق روش کاهش سوپر هیدرید
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کلمات کلیدی
سنتز شیمیایی، پراش اشعه ایکس، مواد نانوکریستال، مواد مغناطیسی،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
Nanocrystalline and surface functionalized Co and Ni were successfully synthesized via superhydride reduction route by using oleic acid and oleylamine as capping agents. Fourier transform infrared (FTIR) study of as-prepared materials confirms the presence of organic capping layer on the surface of nanoparticles. Phase purity and crystallite sizes of the materials were ascertained from X-ray diffraction (XRD) patterns. Co crystallizes in the mixture of hexagonal close packed (hcp) and face centered cubic (fcc) phases with crystallite size of 15Â nm whereas Ni crystallizes in face centered cubic (fcc) phase with crystallite size of 35Â nm. Transmission electron microscopy (TEM) studies confirm the fine particle nature of the materials and spherical shape morphologies with TEM particle sizes equal to 20Â nm and 25Â nm for Co and Ni, respectively. Room temperature magnetic studies show ferromagnetic behavior of the materials. The values of saturation magnetization, coercivity and magnetic particle size for Co are 64Â emu/g, 436Â Oe and 10Â nm, respectively whereas those for Ni are 29Â emu/g, 148Â Oe and 20Â nm, respectively. Dipolar interactions among the particles at lower temperatures have been studied from field cooled (FC) and zero field cooled (ZFC) curves. Low temperature magnetic study shows ferromagnetism with dipolar interactions in the materials up to 300Â K and some sort of magnetic phase transitions below 20Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 374, 15 January 2015, Pages 411-416
Journal: Journal of Magnetism and Magnetic Materials - Volume 374, 15 January 2015, Pages 411-416
نویسندگان
Shankar B. Dalavi, Rabi N. Panda,