The nanocrystalline synthesized by the Co-precipitation method with two techniques based on different in initial molar concentration (pH suspension).The structural and magnetic properties of the products were determined and characterized in detail by X-ray diffraction (XRD), High Resolution -Transmission Electron Microscope (HR-TEM) , Fourier Transform Infrared (FTIR) and vibrating sample magnetometer (VSM). The results suggest the grain size for first technique in the range of 6.14 : 13 nm and second technique in the range of 8.8: 24.4 nm as the calcination temperature increases from 100 to 600°C respectively with different in initial molar concentration (pH suspension) for all techniques. X-ray analysis showed that the samples were cubic spinel structural ( kind of inverse spinel oxide).The crystallinity is improved with the increases calcination temperature for all techniques and that proved by the FT-IR & XRD results and compound purity fabricated. HR-TEM analysis showed that nanoparticles size and the shape based on the initial molar concentration (pH suspension) & the calcination temperatures and also indicates that degree of agglomeration for all samples. VSM analysis showed that all the coercivity values were low enough to emphasize that the ferrite was a soft ferrite or super-paramagnetic behavior for most samples.
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