کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1809822 | 1525208 | 2014 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of magnetic ordering and cation distribution in the spinel ferrites CrxFe3−xO4 (0.0≤x≤1.0) Investigation of magnetic ordering and cation distribution in the spinel ferrites CrxFe3−xO4 (0.0≤x≤1.0)](/preview/png/1809822.png)
Ferrite powder samples of CrxFe3−xO4 (0.0≤x≤1.0) were prepared by chemical co-precipitation, and calcined in a tube furnace with argon-flow at 1723 K for 2 h. X-ray diffraction patterns indicated that all the samples had an (A)[B]2O4 single phase cubic spinel structure with a Fd3¯m space group. Magnetic measurements indicated that the magnetization of the samples decreased with the Cr doping level. A new model for the magnetic ordering in these samples was employed to explain the dependence of the magnetization and cation distribution on the Cr doping level; namely, taking into consideration constraints arising from Hund's rules and from the spin direction of the itinerant 3d electrons, the directions of the Cr2+ and Cr3+ cation magnetic moments were taken to lie antiparallel to the moments of the Fe cations within the same sub-lattice (A or B sub-lattice).
Journal: Physica B: Condensed Matter - Volume 438, 1 April 2014, Pages 91–96