Comparing the role of NaOH and NH4OH on structural and magnetic properties of spinel Ba ferrite synthesized by autocombustion method

Abstract

Abstract A comparison between using NaOH and NH4OH for synthesizing nano Ni0.1Ba0.9Fe2O4 via autocombustion method was done. During the preparation of the two samples, metal salts were dissolved in distilled water and then the two chemical bases were added separately till pH reaches 7.5. The samples were fired at 600°C for 2h. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning electron microscope (SEM), and vibrating sample magnetometer (VSM) tests were utilized to characterize the samples. XRD test showed a spinel cubic pattern for the two samples and their lattice constants were comparable to that in literature. The calculated crystallite sizes for the two samples were so approximated. SEM images showed a greater average spherical particle size for the prepared sample by NH4OH. FTIR analysis illustrated some reaction residuals in the samples prepared by NaOH. The sample prepared by NH4OH showed higher magnetization saturation and low coercivity. Depending on particle size and squarness ratio, the sample prepared by NaOH is more super paramagnetic compared to the other.