کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5396973 1505773 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic properties and local structure studies of Zn doped ferrites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Magnetic properties and local structure studies of Zn doped ferrites
چکیده انگلیسی
A series of nano-particle zinc-doped ferrites samples ZnxFe3 − xO4 (x = 0, 0.17, 0.33, 0.50, and 0.67) were prepared with the hydrothermal method, and the effects of Zn doping on the magnetic properties and local structures of the samples were studied. By increasing zinc content from 0 to 0.33, the saturated magnetization Ms measured with the vibrating sample magnetometry (VSM) method increases, while it decreases by further Zn doping. The experimental results of extended X-ray absorption fine structure (EXAFS) show that most of dopant Zn atoms occupy A site, and only a few Fe atoms at B site are substituted by Zn atoms. The Neel's two-sublattice model and the molecular field analysis of Yafet-Kittel (Y-K) spin-ordering using the three-sublattice model are compared to explain the experimental phenomena. The Y-K angle between the magnetic moments at A and B sublattices is found changing due to the decrease of A-O-B exchange interaction, which shows that the magnetic moments at B site are no longer rigidly parallel to the few remained magnetic moments at A site.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 160, Issues 1–3, August 2007, Pages 1-6
نویسندگان
, , , , , , , ,