Magnetic properties of larger ionic radii samarium and gadalonium doped manganese zinc ferrite nanoparticles prepared by solution combustion method

摘要

Nanoparticles of Mn_(0.5)Zn_(0.5)Fe_2O_4, Mn_(0.5)Zn_(0.5)Fe_(1.95)Sm_(0.05)O_4 and Mn_(0.5)Zn_(0.5)Fe_(1.9)Gd_(0.05)Sm_(0.05)O_4 ferrites are prepared by solution combustion method and characterized to comprehend their structural, microstructural and magnetic properties. The single-phase formation and spinel cubic structure of the samples analyzed by XRD method. The average crystallite sizes were found in the range 10.26 to 16.68 nm. The lattice parameters were found in the range 8.4157 to 8.4508 A. The particle size was studied by using TEM micrographs and found to be in nano range. The results are good agreements with XRD results. A strong correlation between the size of the particle with respect to the Sm~(3+) and Gd~(3+) content has been identified using TEM micrographs. The M-H loop of Mn_(0.5)Zn_(0.5)Sm_xGd_yFe_(2-(x+y))O_4 (where x = 0, y = 0; x = 0.05, y = 0; x = 0.05, y = 0.05) nanoparticles exhibit ferromagnetic nature with saturation magnetization and coercivity. The M-H loop of Mn_(0.5)Zn_(0.5)Fe_2O_4 nanoparticles exhibit a high saturation and remanent magnetization. The saturation magnetization and remanent magnetization found in the range 44.16 to 5.805 emu/g and 24.46 to 0.093 emu/g, respectively. The saturation and remanent magnetization decreases after Sm~(3+) and Gd~(3+) substitution on Fe- site in Mn_(0.5)Zn_(0.5)Fe_2O_4 is because of the distinction in the cation distribution at tetrahedral site and octahedral site. Meanwhile, experiments demonstrate that the solution combustion method has significant effect on structure and magnetic behavior of the prepared ferrite nanoparticles.