Cation Distribution of Zn_(0.5)Me_(0.5)Fe_2O_4 (Me = Co, Ni and Cu) on the Basis of Rietveld Refinement and Magnetization Measurement.

摘要

Ferrite samples of Zn_(0.5)Me_(0.5)Fe_2O_4 (Me = Co, Ni, and Cu) nanoparticles were synthesized by the sol-gel auto-combustion technique. Structural and magnetic properties of the samples carried out by using x-ray diffraction (XRD), vibrating sample magnetometer (VSM) respectively. On applying curve fitting of Rietveld method, unit cell dimensions, ion occupancy and exact coordinates of atoms have been determined. The cation distribution was estimated with the help of magnetization measurements and accessible occupancy of substituted ions in the crystal system. Cationic distribution was also confirmed theoretically from lattice constants calculation. The theoretically lattice constant was found to be 8.5110 A, 8.3911 A and 8.5229 A for the Ni, Co, and Cu doped cations respectively. The saturation magnetization was found to be 110-148 emu/g which is good agreement with their corresponding magnetic moment and distribution of cations of their respective site preference.